You do not have to cut/paste the Buyer information into an Invoice. Just highlight the information, then on the toolbar, click the little blue envelope tool. When you put your mouse on it the tooltip says "Store buyer info"
The information drops into the Invoice for you.
As far as using the Ledger. What is it you are wanting to use?
Do you record Invoice payments? If so, that information is being stored into the Ledger automatically.
Are you wanting to start recording fees and other expenses in the Ledger as well???
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