I don't think you can get there from here using the Switchboard
Manager unless you want to do some special tweaking. No way to pass
arguments.
First, I recommend that you get rid of the datasheet view. You can
achieve the same appearance but a much more useful outcome using the
form/subform paradigm, designing the subform down to the point where
it looks like a line of the datasheet view and then displaying it as
"continuous forms".
Second, since you're trying to do something on a specific record how
about creating a form that either allows you to search for that
specific record or that's based on a query that will prompt for the
record identifier? Have the switchboard call that form. Typically
I'd have a combobox in the header of the form that would allow finding
the particular record. If you create a form like that, the Wizard
will help you get the combobox right.
To do a better job of helping you, we'd have to know a lot more about
what it is (in real world terms) that you're trying to accomplish and
then we'd want to know your table structure.
HTH