a if field 4 of 5 Days from a week

Hello

i have a Event wich have a option of  MO,TH,WE,TU,FR - 5 days

So if any one take 4 days, the 5th should be gray and not a option
So the User can onla take 4 of 5 option

How can i do that ?

Because i have an Type of 1 Week also, that have an better price

THX for answer

Sorry Marcus. This feature is not supported in the extension, so it is not possible

Tuan