That's right but you have more control if you replicate the functionality of the split form. The main form displays a single record. The subform contains multiple records. If you pick one record, that's the one that will be used to filter the main form. Otherwise, we don't know what you are trying to do.
If you are saying you have a continuous form that you filter and you want to use that to control a separate single record form, the question would be why, but you can do it by passing the filter from one form to the other using the OpenArgs. A more likely scenario is to add code to the double click event of the filtered form that opens the selected record in single form view.