Hi Sakthivadivel Somasundaram, Every value in Pro/E have a name. If you have open a part, you must make a double click on a feature. Then you can see a value of this feature. Click Info and switch dimensions. Now you can see the name. For example d0, d1, d2 .... If you click Tools, relations, you can write for example d0=d1 or d0=d1/2 . That mean, Value d0 is the same like d1 or d0 is the half from d1 Open a assembly. In the model tree you must select a part with the left mouse button and then the right mouse button. Activate this part. Double click the feature now. Click Info and switch dimensions. You see that the value have an index for example d0:0 d1:0... Now you can create a relation (Tools, Relation) d0:1 = d0:2 That mean, the value d0 from the part one is the same as the value d0 from the part two. Good Luck! Regards Jürgen