In Chart of Accounts Create a Petty Cash Cashbook. You will do this in the same way as you created your Bank cashbook.

Create an account in the Chart of Accounts. Call it "Inter-Account Transfer - Petty Cash" or something similar.

In the Bank cashbook allocate the money eg. R2000.00 that will be transferred to Petty Cash to the account - Inter-Account Transfer - Petty Cash. This amount is seen as a minus.

In your Petty Cash cashbook, add a transaction manually for R2000.00. This will be seen as a positive as money is coming into the account. Allocate this to the same account - Inter-Account Transfer - Petty Cash. (In the general Ledger, the account Inter-Account Transfer - Petty Cash will always be zero.)

Your expenses will be captured in the Petty Cash Cashbook manually. Each expense is captured as a minus and is allocated in the same way as you would your bank transactions.