How do I append a prefix to element labels based on a selection set of elements?
With the elements in your selection set highlighted in the drawing go to View > FlexTables and right click on the FlexTable that you are going to open the selection based on then choose "Open on Selection"
4. Change the 'Relabel Operation' to "Append" and enter either the prefix or a suffix to be appended. Click "Ok" when you are done.
5. Repeat these steps for each group of elements you need to append a label to
Sorting and relabeling a flextable based on upstream-downstream order