Been requested by closed company to finish out the books with 3 months of sales. Can I do journal transactions with final weekly/monthly numbers? What is best practice?

You're on the right track, @fydaq-adventures!

I'm happy to share a little more information about creating journal entries for the total amount of your sales.

Although a journal entry will report into your accounts, you'll not be able to track your inventory accurately.

Nevertheless, here's how you create a journal entry if you haven't created one yet:

1. Go to the Plus icon.
2. Under Other, select Journal Entry.
3. Enter information as necessary for your entry.
4. Click Save and close.

This way, you'll be able to close your books in no time. And I've included a detailed guide for your reference in creating your journal entry.

Lastly, if you want to track inventory accurately, you can manually create invoices or sales receipts before the closing of your books.

It'll be my pleasure to help you here in the Community if you have any other questions about journal entries. Have a good one!