Yes you can!
So if you set up your parameter as per the below (you could equally use Range, if you don't want someone to have the ability to put in a silly number)
Then create the following calculated field
[Filter Customers on Paramter]
SUM([Sales])>=[Filter to Customer > N]
Bring this onto the filter shelf and set to true.
Equally, you could just use an Aggregated measure filter (as I have done in the second sheet)...although you'll get a slider (which can be typed in) instead of just a text box.
Hope that helps and makes sense
Thanks Joe its works