Quicken should know what shares are available for transfer
When creating a Transfer Shares transaction to move an asset from one account to another, the pulldown list of assets shows every stock, ETF, and mutual fund I've ever owned. Quicken should be giving me a list of the assets currently held in the origin account that are available for transfer. Or at least it should prioritize those assets at the top of the list.
Quicken Mac subscription. Quicken user since 1990.