How to Add Configurations

Sorry for the simple problem but I am having problemscreating configurations. I have a simple part, a washer. I want tocreate multiple versions for 3mm, 4mm,... for different sizescrews. I created a washer then I click the configuration manager,add a bunch of configurations. I double click on one to activateit, modify my sketch to the dimensions I want.

The end result is it modifies the dimensions in everyconfiguration, not just the active one. I active anotherconfiguration, modify it and again this change occurs in everyconfiguration.

What is the process of changing sketch dimensions for differentconfigurations?

I have done this before and it worked but is was buggy. Sometimeonly the active config would change, sometime all the configs wouldchange.

Thanks
Shawn
SolidworksParts And Features