With a new part which has the same overall dimensions and mounting hole dimensions as the original parent part is resulting in failure of almost all the mates. Re-attach mates won't help. Also since the number of components being high it's a pain to resolve individual mates by replacing mate entities. I tried suppressing the original component, fixing remaining componets where they appear and then bringing in the new one but then parent-child relationship is lost obviously. Where am I going wrong.?