Hi Mednax,
first question, what is the exact issue you have...:-)
Now to my suggestiobns; there are actions in the Pre-OS part, called "Device Name Prompter". How you can use this is described here: How to rename Computers Using the LANDESK Provisioning "Device Name Prompter" Action.
Then you have another action in the system configuration section called "Join Domain" where you can configure the domain join, the action should be self explained. If you have configured everything fine and it still doesn't work, we need the logs for the action handler. You can find them under "C:\ldprovisioning" or "C:\Windows\Temp" they are called "DeviceNamehandler.exe.log" or "JoinDomainHandler.exe.log". Check these logs for any errors, maybe it points you in the right direction.
Kind regards
Christian
