Link pin labels over hierarchy

Hi,

I want to know if it is possible to link labels of instances to the labels in the top module, so that if I change the position of a label in the individual blocks it should get reflected in the top module.

Here is an example.

I create a layout of a cell with two labels say Vin and Vout(labels are created with layer "metal pins" correponding to the "metal drawing").

In the top module I instantiate two such cells. And label them as Vin1, Vin2, Vout1 and Vout2.

Now I want to link the Vin1 and Vin2 to the underlying Vin so that in future if I change the cell such that the location of Vin changes, the locations of Vin1 and Vin2 should also chage accordingly in the top module. This helps me save time since I need not do it again in the top module manually. 

Ofcourse the above is just an example. When I have say 15 such cells with quite a few labels each, it takes an awful long time to move the labels for a simple chage in the cell(like moving a single wire). 

I am using layout L. If it is not possible in layout L, will layout XL solve my problem? Or do I need to learn SKILL and try it?

Thanks.