You can change the margin and weight on the boxed objects (except for outside boxes).
Change margin and weight
1.Select boxed objects (it is important to include the box in the selection).
2.On the Tools menu, point to Box, and then click Box and Unbox.
The current margins and weight are read from the outer box, and displayed in the dialog box. Enter new values and then click OK.
The change of affects the position and size of inner objects, thus they are automatically resized and moved as needed.
In case of outside boxing
Don't use the above procedure: simply scale the box to change the margin or change its weight.
Note
•Fred4 cannot distinguish outside boxing from the standard boxing (i.e. when the inner elements are shrunk). Thus, the above procedure is unsuitable for outside boxes, as it would scale/move inner elements (and that's not needed in case of an outside box).