In my store, I have different types of product i.e. clothes for man and women, undergarments. I have created attributes like colours, sizes in length, size in the waist. These attributes have a long range of variation like waist variation are 26-44  these are almost 25 variations. In nop commerce when we add a product and add its attributes we remove unavailable variations i.e we have jeans pent in size of 26,28 and 30 when we add this product and add its attributes we remove all other variation from size attribute which takes too much time. Please suggest a solution or best practices for adding attributes.
I had tried dividing these attributes into parts ( created two attributes and in first I had added variations from 26-34 and in the second I had added from 35-42) but it shows two lists in specification selection.