2.5 Growth Strategy — keeping the bands
Apply to categories writes the bands into category columns 4 and 5 — GROWTH X for the current period and GROWTH Y for the earlier one — so you can use them anywhere a category works: as a Dynamic Reports axis, a filter or a widget.
Decide whether to keep them
Tick Keep after the next import to stop the overnight import overwriting the bands. Leave it unticked if you only need them for today.
Apply
Click Apply to categories. You are told how many records will be stamped before anything is written.
Saving the bands as categories. Rest the pointer on the checkbox to see exactly what will be written.
This replaces what columns 4 and 5 hold
If either column is one you maintain yourself (Me, here on the Categories page), the write is refused rather than overwrite your groupings.