i called ebay. ebay replied: different sizes is duplicated listing.

We selling g clamps. 

I told them, 2" 4" 6" 8 " 10" g clamps are different! Totally different.

But ebay said we must remove current individule listing, then change them to one listing with variation.

But some 

Categories doese not allow varation at all! 

it is hard to set up postage and price. Weight and pakcage are much different!

Who cares for sellers benefit! who cares for our selling history and rank!