Entering by hand. Click any month cell on an account line and type, or just start typing down a column — Enter or ↓ jumps to the next row, ↑ goes back up, focus selects the whole figure for a fast overwrite. Paste a copied block into the first cell to fill many rows and months at once. Escape cancels.
Keeping it current. The import tab is the fast path — accounting drops in a fresh QuickBooks export and the whole report re-reads in one step, new months included.
Where it lives. Imports and typed figures save to this link in whichever browser made them. For AP and ownership to see each other's numbers without passing a file, this needs a shared backend — that is the next step whenever you want it.