default to "voluntary termination" as action while resigning

Summary

how to default action to "voluntary termination" when doing a resignation

Content

is there a way to default to a specific action "voluntary termination" while an performing the "resignation" action? right now it defaults to "involuntary" and we don't want employees to select this action at all. i can't just hide this, because i do want to display the action reason field, which is driven by the selection of the action. action reason changes when you select different action. voluntary termination has it list of action reason and involuntary termination has it's own action reason.