The operation of the mask equals the procedure of duplicating groups of elements.
Procedure:
The elements to be changed are selected. By clicking the button Mass change in the ribbon, the tab "Mass changes" is opened. Then choose the function Rename element.
Example: Renaming an element
By clicking on the Set button, a dialog opens which is familiar from the Rename function.
After entering the desired changes, click the Execute button in order to rename the elements accordingly.