That sounds like a tedious approach. Why not have a listbox of employees (if there are hundreds you can probably filter this list) and multi select from the list, then click some button and populate either a continuous or datasheet form below? The unbound controls you use for the search parameters would go in the form header. The results can go in the form detail section. Those records would have a field that you could enter data into. If you want to make that a checkbox field you can do that if all you want is a yes/no result, but checkbox fields are not the best for handling Nulls.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.