A method in which profiles which are to be assembled for a rail system which is suitable for guiding movable doors are selected from the following individual profiles: a) at least one first profile having a minimum length and a maximum length and provided with fixing holes, and manufacturable discrete profile lengths to be selected in between said minimum length and said maximum length; and b) at least one second profile having a minimum length and a maximum length and provided with fixing holes, and manufacturable discrete second profile lengths to be selected in between said minimum length and said maximum length; and c) at least one third profile having a minimum length and a maximum length and provided with fixing holes for the first profile and/or the second profile, and manufacturable discrete third profile lengths to be selected in between said minimum length and said maximum length; and d) at least one bend profile having a minimum bending angle and a maximum bending angle and provided with fixing holes for the second profile, and manufacturable discrete bending angles to be selected in between said minimum bending angle and said maximum bending angle, characterised in that the first profile: - has a minimum length of 2210 mm, and - a maximum length of 9200 mm, and - the first profile lengths to be manufactured are manufactured in n steps, depending on the requirements, from the minimum length to the maximum length, that the second profile: - has a minimum length of 1490 mm, and - a maximum length of 8490 mm, and - the second profile lengths to be manufactured are manufactured in m steps, depending on the requirements, from the minimum length to the maximum length, that the third profile: - has a minimum length of 2380 mm, and - a maximum length of 8880 mm, and - the third profile lengths to be manufactured are manufactured in p steps, depending on the requirements, from the minimum length to the maximum length, that the bend profile: - has a minimum bending angle of 0 degrees, and - a maximum bending angle of 35 degrees, and - the manufacturable bending angles of the bend profile are manufactured in t steps, depending on the requirements, from the minimum bending angle to the maximum bending angle, and that: - n is equal to 14, and/or - m is equal to 14, and/or - p is equal to 13, and/or - t is equal to 7, that with respect to the profiles to be assembled, or extended if necessary, a selection is made from only the above-mentioned first profiles, the second profiles, the third profiles and the bend profiles, and that input data concerning the required rail system are supplied to a computer program, the input data are: internal width, internal height, selection of the rail system i.e., a normal, high, or low system which may or may not follow a roofline, or which is a vertical system, or which is a system which at least substantially follows the roofline at a specific angle, on the basis of which input data and said selection of the above-mentioned available, individual profiles (CP; TR; VA; BP), output data are generated by the computer program which output data are: the profiles (CP; TR; VA; BP) to be actually manufactured, their profile lengths, the position of their fixing holes to be punched and the bending angles of the bend profiles, and an overview of these output data is provided on the basis of which an operating machine manufactures the required profiles (CP; TR; VA; BP). a) at least one first profile having a minimum length and a maximum length and provided with fixing holes, and manufacturable discrete profile lengths to be selected in between said minimum length and said maximum length; and b) at least one second profile having a minimum length and a maximum length and provided with fixing holes, and manufacturable discrete second profile lengths to be selected in between said minimum length and said maximum length; and c) at least one third profile having a minimum length and a maximum length and provided with fixing holes for the first profile and/or the second profile, and manufacturable discrete third profile lengths to be selected in between said minimum length and said maximum length; and d) at least one bend profile having a minimum bending angle and a maximum bending angle and provided with fixing holes for the second profile, and manufacturable discrete bending angles to be selected in between said minimum bending angle and said maximum bending angle, - has a minimum length of 2210 mm, and - a maximum length of 9200 mm, and - the first profile lengths to be manufactured are manufactured in n steps, depending on the requirements, from the minimum length to the maximum length, - has a minimum length of 1490 mm, and - a maximum length of 8490 mm, and - the second profile lengths to be manufactured are manufactured in m steps, depending on the requirements, from the minimum length to the maximum length, - has a minimum length of 2380 mm, and - a maximum length of 8880 mm, and - the third profile lengths to be manufactured are manufactured in p steps, depending on the requirements, from the minimum length to the maximum length, - has a minimum bending angle of 0 degrees, and - a maximum bending angle of 35 degrees, and - the manufacturable bending angles of the bend profile are manufactured in t steps, depending on the requirements, from the minimum bending angle to the maximum bending angle, and - n is equal to 14, and/or - m is equal to 14, and/or - p is equal to 13, and/or - t is equal to 7,