spiral inductor for board level design or on chip inductors?
BTW, here is fast and easy steps:
1.define unit length micron mil or mm in new project dialog box.
2.start a new layout from tool bar
3.define layer names in options>layers
4.define snap and grid as your need
5.define layer stack and electrical specifications of them in momentum>substrate>creat/modify
6.Precompute the substrate for wanted frequency
7.Draw your structure
8.insert internal probes
9.simulate by momentum (More accurate)or momentum RF
10. convert S-Parameter results in data display by @dsfunctions.
11.read momentum help for more infos!
12.Good bye and have a nice day!!!