I don't user Quicken so forgive if this isn't as simple as it sounds. Using a form with a control (textbox likely) where you type in the dollar amount, two other parameters would be required: the account to take the amount from and the account to move it to. These two would likely be combo boxes so you can control the list of possible accounts associated with the user. Upon click of a button, an positive entry goes into account A say $45.00, and a corresponding entry goes into account B ($45.00) or -$45.00 if you're not using accounting notation (wherein negatives are enclosed in brackets). The individual entries can be listed in a report or form, likely ordered by date for the user, formatted in any way that suits you along with textboxes that calculate the sum of negatives and positives for each account. The sum of 100.00+(10.00) is 90.00, so if those were the only two transactions for the account, the balance would show as $90.00 and the individual entries would be available for display. NEVER store calculated values (e.g. balances) for financial transactions such as this.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.