i am usally dont use the blender for modelling but i kind of need it to use this time. I have a eyewear model and i need to scale it to certain dimensions. For example for the temple pieces, there is hinge assembly engravings and i need to make temple longer without scaling hinge's engravings. When i use simple scaling, it becomes longer as whole ofcourse but i am trying to make it longer without effecting the as whole so that hinge part will be stay the same. It just like adding extra part to make it longer then simply scaling it. I assume it is like parametric scaling or something, i am not sure if it is called like it.