Referencing a control on an Access form is easy. Referencing a subform and its controls is a little more complex. To Access, a subform isn't a form at all, but a control, so you must reference it as ...

Adding a number to each record in an Access report can be helpful to readers. Learn how to add the appropriate control and expression to get the right results. Referencing a control on an Access form ...

probably not, but i'm sure you can use code to navigate back to the record that it was on. check out using bookmarks (i think that's what they are called).