A cutting method for cutting a glass sheet according to a cutting program comprising: - a plurality of first cut lines which are parallel to each other, to separate one or more crosspieces from a remaining part of the sheet, and - at least two second cut lines, orthogonal to said first cut lines, to divide one of said crosspieces into at least three pieces; the method being implemented by means of a cutting machine comprising: - a sheet supporting surface (15,16), - feed means for feeding the sheet in a longitudinal direction and - a cutting station, which is fixed and houses sheet-cutting means running along a cutting path, which is orthogonal to said feed direction, and divides the supporting surface into an upstream supporting area and a downstream supporting area; the method comprising the steps of: - arranging a sheet to be cut on the upstream supporting area; - feeding the sheet to be cut in the longitudinal direction through said cutting station; - positioning the sheet to be cut in the cutting station and cutting it along a first cut line so as to obtain the crosspiece; - retracting the remaining part of the sheet, which is arranged on the upstream supporting area, so as to space the remaining part of the sheet from said cutting path; - rotating the crosspiece about an axis orthogonal to said supporting surface after the retraction of the remaining part of the sheet; - cutting the crosspiece after the rotation so as to form the second cut lines, thus forming said sheet pieces; - lifting from said upstream supporting area at least a front edge of the remaining part of the sheet, which is adjacent to said cutting station, before the crosspiece cutting step; characterised in that: - the rotation of the crosspiece is carried out so as to keep all of the second cut lines, which should then be made, on the downstream supporting area; - during said cutting step, the crosspiece is progressively retracted through the cutting station towards the upstream supporting area; - during said cutting step, at least one of the sheet pieces is inserted and temporarily stored beneath the remaining part of the sheet; - the sheet pieces are removed from the upstream supporting area after the cutting along the second cut lines has been completed. - a plurality of first cut lines which are parallel to each other, to separate one or more crosspieces from a remaining part of the sheet, and - at least two second cut lines, orthogonal to said first cut lines, to divide one of said crosspieces into at least three pieces; - a sheet supporting surface (15,16), - feed means for feeding the sheet in a longitudinal direction and - a cutting station, which is fixed and houses sheet-cutting means running along a cutting path, which is orthogonal to said feed direction, and divides the supporting surface into an upstream supporting area and a downstream supporting area; - arranging a sheet to be cut on the upstream supporting area; - feeding the sheet to be cut in the longitudinal direction through said cutting station; - positioning the sheet to be cut in the cutting station and cutting it along a first cut line so as to obtain the crosspiece; - retracting the remaining part of the sheet, which is arranged on the upstream supporting area, so as to space the remaining part of the sheet from said cutting path; - rotating the crosspiece about an axis orthogonal to said supporting surface after the retraction of the remaining part of the sheet; - cutting the crosspiece after the rotation so as to form the second cut lines, thus forming said sheet pieces; - lifting from said upstream supporting area at least a front edge of the remaining part of the sheet, which is adjacent to said cutting station, before the crosspiece cutting step; - the rotation of the crosspiece is carried out so as to keep all of the second cut lines, which should then be made, on the downstream supporting area; - during said cutting step, the crosspiece is progressively retracted through the cutting station towards the upstream supporting area; - during said cutting step, at least one of the sheet pieces is inserted and temporarily stored beneath the remaining part of the sheet; - the sheet pieces are removed from the upstream supporting area after the cutting along the second cut lines has been completed.