For a 2D harmonic magnetic analysis, you can specify the loads listed below:
Constraints - vector potential (AZ) or time-integrated scalar potential (VOLT)
Forces - current segment (CSGZ) or current (AMPS)
Body loads - source current density (JS)
To apply, delete, list, or operate on, these loads or apply load settings, use the commands listed in Loading Options for 2D Static Magnetic Analysis. The only difference is that you will not use the SF family of commands; they manipulate surface loads, which do not apply in harmonic analysis).