Selecting Insert - Via - Draw Via Rectangle allows you to create a via rectangular polygon. Once the rectangle is added to the circuit, it is subsequently treated like any other polygon with no restrictions.

 , down one level
, down one level  or down to ground
or down to ground  .
.If you wish to add more than one rectangle at a time, press the shift key while making the menu selection or click on the Pin mode button  in the Add Via Rectangle tool bar. This will leave you in Add Via Rectangle until you explicitly exit this mode by selecting another command or clicking on the Cancel button
 in the Add Via Rectangle tool bar. This will leave you in Add Via Rectangle until you explicitly exit this mode by selecting another command or clicking on the Cancel button  in the Add Via Rectangle tool bar .
 in the Add Via Rectangle tool bar .
You may enter the location of the points used to create a rectangle using the keyboard, see Keyboard Entry of Points and Polygons for details.