You can use the Rotate… command from the Geometry menu to rotate the selected joints in the Frame window.

§    Select the part of the structure to be rotated

§    Choose Rotate… from the Geometry menu

A dialog box will appear with the rotation centres and angles.

§    Enter the coordinates of the axis you wish to rotate the selection about

§    Enter the magnitude of the rotation for the appropriate axis

§    Click the OK button

Rotating is done relative to the axis you specify with the coordinates.  For example, suppose you wanted to rotate the whole frame by 30° about a line parallel to the z axis passing through the point x=10, y=20.  You would first select the whole frame, and then you would enter x=10, y=20, z=0, Øx=0, Øy=0, Øz=30 in the Rotate dialog.

Multiframe will not create a connection between joints that you superimpose on top of each other using this command.

When rotating the selected joints you should enter only one non-zero angle.  That is, Multiframe can only do one rotation at a time.