Split in the transaction when you need to assign more than one category to a single transaction. For example, a check you write to a car dealer might cover fuel, license, and a lease payment. You can split the transaction by entering category names and amounts for each part of the transaction.
To split a transaction category:
At the create/edit transaction window click Options - > Split
You will see the list of categories. Check all required categories. Click OK. You will see the split categories view. Near each category at the right you can type in the amount. When click Ok.
If the total amount of the splitted categories will be more than entered before while entering the transactions details you will see the warning and will be given the opportunity to adjust the transaction amount to equal the amount entered by the splits or return to split categories view to change the amount of any of the splits.