The PA DOR refers to tax payment plans as Deferred Payment Plans. The DOR does not have a form that should be filed to establish a DPP. Instead, taxpayers are instructed to call the DOR Collection Unit (717-783-3000).
PA has other options also to pay taxes owed, see the following.
What are my options for paying the personal income tax that I owe?
https://revenue-pa.custhelp.com/app/answers/detail/a_id/1435/~/payment-options