Filtering forms.... :/

Hey guys, I just have a (probably) really simple question for you. I'm using a datasheet that can be filtered for certain fields. I have a macro that opens a form to the record that was selected (aka "current") in the datasheet. It filters this opened form to "1 of 1" which makes sense. How would I go about filtering that form for all of the records left (after filtering) in the datasheet?

PS: I hate macros, but I'm doing client-specific work.
PSS: The primary key is a field (autonumber) called "ListingNumber".

Filtering forms.... :/