Global Options And Allowed Combinations

Hi. I am a little confused with using Global Options with regards to Allowed Combinations.

I am just setting up my website. I have 100's of products with the same options and allowed combinations of those options.

Global options sounds great as it appears i can add a new option there and it will automatically be added to all the products but then it seems i still have to go in to each of the products anyway and update the allowed combinations for the newly added option/s.

Is there a way to do a bulk update to the allowed combinations?

Thanks in advance