Hi i run a cash business all my sales are in cash, i pay for some small purchases from this cash, how do i record these in quickbooks?

It's a delight to see your post here, bjmameslennon.

You can record sales in cash as cheques or expenses in QuickBooks Online (QBO). 

Here's how to a create Cheque:

1. Go to the Plus icon.
2. Under Suppliers, choose Cheque.
3. Enter the necessary information. 
4. Click Save an close.

Here's how to a create an Expense:

1. Go to the Plus icon.
2. Under Suppliers, choose Expense.
3. Enter the necessary information. 
4. Click Save an close.

Leave me a comment below if you have questions. I'd be here to help. Have a great day!

I assume you receive cash & bank it every now & again (unless your mattress is particularly lumpy?!)

Set up a new Bank Account in QB - Petty Cash or Cash at Hand.

Use this account to receive payments in QB & also to record the small purchases you make.

When you pay money into your bank, simply record this as a Transfer between Bank Accounts in QB.

If you happen to buy any personal items with the cash, this can be recorded as Drawings in the usual way.

I'm sure there will be a way to pay cash from Undeposited Funds account too - but I prefer to record Petty Cash as a separate account as above.