Method for changing a factory-set design relating to a yarn-lot manufacture of a textile machine, more particularly an open-end rotor spinning machine, to a configuration different from the factory-set design, on the basis of a specific requirement, the textile machine having a plurality of workstations for producing a yarn lot (A1; B1; C1), and a central control device, which is designed to control, on the basis of a control routine (20; 30; 40; 50) which can be read out from a memory, the workstations which produce a same yarn lot (A1; B1; C1) with control data (A2; B2; C2; D2) required for producing the same yarn lot (A1; B1; C1), and the workstations being factory-equipped such that different yarn lots (A1, B1, C1), having at least a first yarn lot, a second yarn lot and a third yarn lot, can be produced by means of the workstations independently of each other, characterised in that the method has - a step of creating a selection of control routines (20, 30, 40, 50), having a first control routine for controlling all workstations with control data for producing the first yarn lot, a second control routine for controlling a first group of workstations with control data for producing the first yarn lot and for controlling a second group of workstations with control data for producing the second yarn lot, and a third control routine for controlling groups (A; B, C, D) of workstations, which groups are to be defined with respect to the number of groups, with control data (A2; B2; C2; D2) corresponding to respective yarn lots (A1; B1; C1) assigned to the groups (A; B, C, D), the number of the groups (A, B, C, D) which are to be defined exceeding two; - subsequently, a step of activating a control routine (20; 30; 40; 50) stored in advance, selected from the created selection of control routines (20, 30, 40, 50); - subsequently, a step of assigning workstations to a group (A, B, C, D) to be controlled on the basis of the activated control routine (20; 30; 40; 50); and - subsequently, a step of controlling the group (A; B; C; D) of workstations in question with correspondingly assigned control data (A2; B2; C2; D2) on the basis of the activated control routine (20; 30; 40; 50) by means of the central control device, the activated control routine leading to a configuration of the textile machine which is changed in comparison with the factory-set design of the textile machine. - a step of creating a selection of control routines (20, 30, 40, 50), having a first control routine for controlling all workstations with control data for producing the first yarn lot, a second control routine for controlling a first group of workstations with control data for producing the first yarn lot and for controlling a second group of workstations with control data for producing the second yarn lot, and a third control routine for controlling groups (A; B, C, D) of workstations, which groups are to be defined with respect to the number of groups, with control data (A2; B2; C2; D2) corresponding to respective yarn lots (A1; B1; C1) assigned to the groups (A; B, C, D), the number of the groups (A, B, C, D) which are to be defined exceeding two; - subsequently, a step of activating a control routine (20; 30; 40; 50) stored in advance, selected from the created selection of control routines (20, 30, 40, 50); - subsequently, a step of assigning workstations to a group (A, B, C, D) to be controlled on the basis of the activated control routine (20; 30; 40; 50); and - subsequently, a step of controlling the group (A; B; C; D) of workstations in question with correspondingly assigned control data (A2; B2; C2; D2) on the basis of the activated control routine (20; 30; 40; 50) by means of the central control device,