I'm going thru the dimensions and naming them as I go but I'm not able to do the thickness as a feature as it's already been used for the length. Any ideas?
Yes that is correct behavior. You can add a prefix/suffix to that name.
Are you wanting to capture the dimension AND the feature?
In my example I have captured the radius of the Fillet1 (fillet radius) so that I can change the radius via DWX.
I also captured the feature of Fillet1 (FILLET) so that I can suppress and unsuppress via DWX.
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