Multiple Products from one generic Product

Hello,

Good Day Everyone

Could you help me about this question

If i have a product (consists of like 30 part) and this is like a generic product, and i need to change the main dimension (W*H*D) of this product to make a new other products but with taking into considerations the common parts (5 parts are common without changing any dimension) from the generic part to the new products, so how to do this?