Cash income

Use a sales receipt for the customer rather than an invoice.

Create a service item named tips and link it to an income account, maybe tips-income.

add that item to the invoice or sales receipt when required.
and/or on the deposit on the next line select tips-income and enter the amount

So if I collect the cash throughout the week and only go to the bank once a week to deposit, that deposit needs to directly match up to the invoices and or sales receipts I have entered?

I appreciate you for getting back to us, afreed4.

Yes. The system has to ensure that the transactions entered matched to what's recorded on your bank. If it can't find a match, it creates a new transaction record for you.

I've added this article that has detailed information about categorizing transactions: Categorize and match online bank transactions in QuickBooks Online.

I'll be around if there's anything that I can help with. Keep safe!