He madmyes,
When it comes to managing your transactions with ease, QuickBooks is the go-to program for small businesses. I'll be happy to share more info so you can manually record your transactions in QuickBooks without linking a bank account.
I encourage you to check out step 4 in the following helpful article that shows you how to: Manually upload transactions into QuickBooks Online. The article provides the necessary steps required in order for you to achieve the goal you've reached out about.
You're more than welcome to ask questions as you go through the article, I'm here to assist. Otherwise, I wish you a great rest of the week.