You can either copy a single column, a selection or a whole tab.
iDoceo will only transfer data for those students that are present in both the source and target classes
To copy a column: Tap&hold on the column's header / Copy / To another class
To copy a selection of columns: Tools icon (top bar) / Select your columns and Copy / To another class
To copy a whole tab: Tap&hold on a tab / Copy / To another class
Copying a class structure, with or without students