Hi Susy1000,
I know that these kinds of transactions can be a bit tricky to record in QuickBooks Online. One of the beauties of the program is being able to choose the accounts and payment methods that suit your needs. carolineambrozio has you off to a good start with her suggestion of considering a journal entry and consulting an accountant, and I'd like to expand upon those options a bit.
In QuickBooks Online, it's possible to set up a number of kinds of accounts, including cash, bank, and credit card accounts. You can even set up accounts for loans, which this article walks you through in detail: Set up a loan in QuickBooks Online.
The key thing to consider with your situation is where the money is coming from and where the money is going to. For instance, a cash account would signal an account in your company that uses cash. It'd be similar to a cash on hand or maybe even a cash in drawer situation. Instead, you'll want to think about where you allocated the cash received from the partner. For instance, if it was deposited to a bank account, you'll want to reflect that there, and the article I've just shared can help.
Please feel free to take a look at that article to learn how you can get started with this, and then consult an accountant if you had any further questions. If you'd like to learn about the different kinds of accounts in QuickBooks Online, this is another useful article: Learn about the chart of accounts in QuickBooks
Wishing you the best with this.
