This concerns the combobox in the subform on the Comms Tracking tab?
Options:
1. create the set of five records all at one time and instead of combobox make the control a locked textbox - all user does is enter the date for each step
2. unbound form with 5 'rows' of unbound controls and use code to save record
This thread discusses both of those options
https://www.accessforums.net/forms/checklist-35706.html
3. restrict the combobox RowSource after each record is created - problem with this is your subform is in continuous view and the combobox RowSource is a lookup saving the step ID instead of the step description. When the combobox is restricted to eliminate steps already used, the description alias is not available and the combobox will be blank. Only ways to handle this are to have a textbox display the related alias description or to save the description to tblCommsTracker