You can use the Peer Variables command to associatively link variables between parts within an assembly or subassembly. For example, you can control the flange thickness of Part B using a variable in Part A. When you edit the value for the variable in Part A, the flange thickness in both parts is changed simultaneously.
In an assembly, Choose Tools tab→Variables group→Peer Variables.
In the assembly window, select the part from which you want to copy a variable (Part A).
In the Variable Table for Part A, click the button adjacent to the row you want to copy.
Click the right mouse button to display the shortcut menu, then click Copy.
In the assembly window, select the part that you want to paste the variable into (Part B).
In the Variable Table for Part B, click the button adjacent to the row for the variable you want to control.
Click the right mouse button to display the shortcut menu, then click Paste Link.
To take advantage of this functionality, you must first set the Paste Link To Variable Table option on the Inter-Part tab on the Options dialog box.