How do you add a transaction to quickbooks that hasnt gone through bank account?? I.e cash purchase?

Let me show you how to record cash transactions, @laelectricalserv.

You can create a Petty Cash Account or Cash Account within your Chart of Accounts to record your cash transactions.

Then, create a cash account from your Chart of Accounts. Then, write a cheque to record this cash expense.

Here's how to create a cash account from your Chart of Accounts:

1. Go to the Gear icon (⚙), then Chart of Accounts and select New.
2. On the Account window that appears, choose Cash at bank and in hand from the Account Type drop-down.
3. Then, set Cash on hand as the Detail Type.
4. Enter Petty Cash or Cash as the account name.
5. Select Save and Close.

You can now record the cash purchase by writing a cheque:

1. Go to the Gear icon and the Cheque.
2. Set the cash account that you’ve created as the Payee.
3. Use the expense account appropriate for the purchase.
4. Click the Save and close button once you’re done.

See this article for more information: Set up and use petty cash.  

Let me know if there's anything that I can help about your account by leaving a comment below. Enjoy the rest of the week.