FICTIONAL INPUT, EXPECTED RESULTS ONLY; NOT AN EXCEL EXECUTION LOG.
Default: A/2026-01=100; A/2026-02=200; B/2026-01=300; B/2026-02 has no input.
A total=300; B total=300; January=400; February=200; Grand total=600.
Test 1 only: change Data!C3 from 200 to 250 -> A=350, B=300, total=650. Restore 200.
Test 2 only: append B / text 2026-02 / numeric 50 in Data!A5:C5 -> A=300, B=350, total=650. Clear only those new inputs.
If both changes are present, grand total=700.
A Grand Total message is a numerical cross-check, not proof of correct business inputs. Compare branch and month cells manually.
