How can we define time stamp in rough cut planning profile

Hi

There is no time stamp(From date to date) in Rough cut planning profile and it is just time span (0-5 ,5-10,... workdays) . If I have different capacity for my resource in different intervals how should I define it so that in planning table it can take it to account and show me requirement versus avalilable capacity acoordingly.Note that we are working with repetitive plannig and our resources are lines which have different production rate between each interval.

Regards

Babak Bolourchi