Yes in ABS it will go down to 2 inchs...so if your machine is at 2.000 and you run the script the machine will just sit there

If you are at 3.000 it will come down/up (depending on your machine) to 2.000.
If you want to increament in ABS you can:
DoOEMButton(1001)
'Wait for machine to stop
While IsMoving()
Sleep 100
Wend
'Get current Z
current_Z = GetOEMDRO(802)
'Add 2' to z
inc_z = current_Z + 2
'Sent command you can use G1 as well if need
Code "G0 Z" & inc_z