Soft Edge one side only

[VjLuper]

Hello wonders! I have a problem with soft edge. I need to map this nice texture onto two objects. Because of the way the objects are built, I need the soft edge to work on one side but not on the other.

Let me explain better: I want a soft edge between 1 and 2, and then again between 3 and 4 — BUT NOT between 2 and 3.
How can I achieve this?

[Zoltán]

Slices with same source are doing soft edge groups.
Create a new Screen, then set the two slices on the right to get their input from that screen