Elements of your drawing may be modified using theicons on the lower left side.
The first icon is used to combine objects into groups that can be operated on as a whole. For example, if you have a row of boxes, you can weld them into a group by these steps:
Click on the grouping icon (under ). “Handles” (little boxes) will appear on the screen for each object.
Tag the objects you want to group: left-click on the handle of each you want to group.
You can also tag all the objects in an area by this procedure: center-click above the upper left corner of the items; then drag the mouse to a position below and to the right of the items, and center-click again.
Once you have tagged the items in your group (and their handles have turned solid), right-click to form the group.
You can now move and copy the group as a single item.
To break a group back into its component objects, use the “break compound” icon.
To move an object or group:
If you want to move the object either straight up, straight down, straight left, or straight right, substitute a center-click for the left-click in the step 2 above.
Copying is just like moving, except that after step 4 there will be a completely new object at the new position, and the old object will still be there.