Hi Please Reply Anyone ASAP

I have one Multiselect picklist,this values are 1,2,3,4,5,6 and one check bok is also there.now if i am selecting 1,2 values and select the checkbox is true i want display two Empty Text Fields and if i am selecting only one value in That picklist and select checkbox is true i want to display only one Empty Text Field How can i achieve this Requirement Without Coding