Assign groups action performs the same process as the Assign groups command.
If the macro step is performed on project level, the step creates a text file for each block. The text file stores the group number and center coordinates of each group that is cut by the block boundary. The enables the harmonization of group numbers along block boundaries with the Fix border groups macro step.
Return value: Number of points that were effected by the process or -1 if the process failed.