State tax filing

Upon further research, I found the following publication (GIT-9P) on the NJ Department of the Treasury publications page, specifically referring to Question 7 (page 35) below:

So, according to above, it appears like Line 6 on Schedule NJK-1 ("Net gain (loss) from disposition of assets as a result of a complete liquidation") only needs to be populated when the entire partnership has been completely liquidated.

In my case, I am just a single partner who sold my share of interest in the MLP (i.e. the partnership itself continues to operate and has not been completely liquidated), so Line 6 on my NJK-1 can be left blank.

With that said, I will manually create the NJK-1 for myself and attach it to my NJ tax return accordingly.

It's unfortunate that none of the experts here could help, but I hope this understanding is correct and will assist others who may cross a similar path as mine. Cheers.