Open the UCS dialog box by selecting the UCS 
button from the Advanced toolbar.
Click the New button.
Name the new UCS.
If you want to create a copy of an existing UCS, Click From UCS and then select the UCS in the drop down list. Click OK. You can then modify your new UCS using the UCS dialog box.
If you want to use the alignment wizard, Click Use alignment wizard. Click OK. Use the alignment wizard to position your new UCS.