How are folks handling I/C allocations in NetSuite? Is it better to have new GL accounts or are you using Department/Class to handle it? Would appreciate input!

Aside from following @Olivier Gagnon (DXC) advice you should also (if you havent) check with your accountants (the ones that audit you) as you should have transfer pricing agreements in place to back up your allocations...generally these things need to mimic arms length transactions.