How to set up coverage end date when someone chooses to waive during a life event

Summary

Need set up help for when someone previously covered chooses to waive coverage. We want to determine the end date of coverage.

Content

Currently, when someone waives coverage during a life event the coverage ends immediately, but we would like for the coverage to go through the end of the month. Need ideas on how to set hat up...I'm stumped.

Thank you.