I have this product that has 2 attributes:
1) width
2) height

Any of these can be anything from 1/8" to 24" (at 1/8" steps)

Meaning I need to enter 192 values!!! and then duplicate it.

I can't put textbox for that, I want to give the fixed number of options to the customer.

Is there a less painfull way of doing this rather then entering one-by-one and waiting for everything to refresh every time?

Is there an offline editor or client I can run on my workstation instead of entering via the explorer?