I was going to suggest using a memorized Transaction. Just like a Scheduled Reminder, it can do what you ask for.Just memorize a correctly categorized transaction, then locate it in Tools / Memorized Payee List. Edit the split category amounts down to 0, save the entry and enable the "Lock this entry" flag, to prevent it from ever being changed by a future transaction.
but it would be simpler if you could just have a way to move the line items up and down the list.
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For Credit Cards or other monthly bills, you should not make a split transaction. The proper way is to set up a separate ACCOUNT and enter the individual transactions into it when the purchase is made and assigning it to a category. Then when you pay the bill you TRANSFER the payment from your checking account to the credit card account. Then when you download the payment from the bank you match it to the one you already entered. Then your credit card account should match what you actually owe at any time.
When you enter the payment in your checking account you put the credit card account name in for the category using square brackets around the name to indicate it is a transfer...like this… [credit card] or newer versions have a Transfer column.
It would be really nice if you could enhance the split transaction screen: 1. Add Ability to reorder the items 2. Ability to clear just the values