There are a great many ways that you might do that.
A very simple approach is to add a field to this table of drills where a specific value in that field "marks" it as a "favorite". Then portals, finds, value lists can all use the value in this field to produce a list of just those records selected as a "favorite" drill.
This field might be a field formatted with a single value check box format. Clicking the check box selects the drill as a favorite, clicking it again deselects it as a favorite.