Representing Transfer from a Transactions Account into Positions Only Account

I'm not sure how to best model a transfer from a transactions account like a checking into a positions only investment account. In some other investment accounts that support txns it's useful for me to see that lineage of where the funds came from and have it modeled as a transfer. Anyone have some suggestions or tricks?
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Generally speaking, you would create a Transfer transaction from the checking account to the investment account. This will then show up as Payment/Deposit transaction in the investment account with a positive Amount. The cash balance in the investment account will increase by this amount. Then you create one or more Buy transactions in the investment account to reflect the use of that balance to purchase the investment positions. At this point, the cash balance in the investment account will be back to zero (or whatever it was before creating these transactions).
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