Extending Framing Studs From 8' to 9'
In a non-load bearing wall the studs are really just nailing edges for the drywall.
You could just scab pieces to the side of the 8' to make 9' studs.  So take the 8' get a 1' piece and then get a piece that is 16&quot; and use it to join the 1' and 8' together, 8&quot; on either side of the splice.