Sure, Migal. This is one is for 2 figures, a room and a window. The actors 'fill' are in the window, and the actor 'cutout' is in the room, (which is a separate figure).

When this SET is applied to the window figure, it moves the BODY (Xtrans), switches on one 'fill', switches off the other 5, and switches off the cutout (from the room figure)

{
        version
        {
                number 4.01
        }
        actor BODY:1
        {
                channels
                {
                        translateX xtran
                        {
                                keys
                                {
                                        k 0  -0.6975
                                }
                        }
                }
        }
        actor fill_1:1
        {
                off
        }
        actor fill_2:1
        {
                off
        }
        actor fill_3:1
        {
                on
        }
        actor fill_4:1
        {
                off
        }
        actor fill_5:1
        {
                off
        }
        actor fill_6:1
        {
                off
        }
        actor cutout_1:1
        {
                off
        }

}

This is just to demonstrate that you can add as many actors to a SET as you like, as long as you don't specify a figure, but just use 'BODY:1'. This one has a BODY translation, but if you're just affecting specific actors, you can have any figure at all selected, click the SET, and Poser will look through all the figures in the scene until it finds the correct actors to modify.

You cannot use this for MAT files. If you do, Poser just adds the extra materials to the figure you apply it to, It doesn't go looking for other figures with those materials. Pity...

mac