Extra Fields by Category

[Eagle Rock]

We have about 25 categories (and sub cats) with anywhere from 5 -50 products in each

Each category product has a bunch of extra field information which I need to collect.

I added all the "extra fields" via the admin - but now there are so many - so when a new product comes up - like 100 extra fields come up - when really maybe only 15-20 apply to that product.

Is there a way I can show only the fields for that category ? I numbered them in batches - so if I could say

if catid = "devices" show fields 100-150 ...I would be good.

Just not sure where to look for this code ? SInce this is in the admin

Thanks