Accidentally deleted rate plans and calendar now has no prices ("price missing")


I am new to booking.com and finding it challenging to list our beach house (seems quite difference to airbnb and vrbo).

I was trying to change the base/default nightly rate and accidentally deleted the rate plan.  Now the calendar has no pricing (showing "Price Missing" label on every day - even after I add back a rate plan).

 Naturally I don't want to update every day in the calendar so was hoping I can somehow re-apply the base rate plan to the calendar.   I tried selecting a huge date range on the calendar and adding the rate but the rate now seems to be independent of any plan.

Hoping there is a simple solution.