Is there a crieria in the system or possible PCF that would represent if a stock falls 10-15% in price from the entry price i paid for the stock?

If so, I want htis as a column in my WL

Also, Is there a column or condition I can use that will determine of a stock i am currently in an open position with jumps significanty in price, if I can take partial profit from it but not close out the entire position? Is this do-able? I guess perhaps sell some shares but not all?

Other than manually creating a Condition Formula for your entry price for each trade of interest, no. What you could do is create a Personal WatchList with a WatchList Column for Tracking %.

Copying Symbols to Personal WatchLists

You can right-click on any symbol in a Personal WatchList and select Edit Tracking Values to set a Price, Shares and Entry Date for that symbol. You can then select Add Column and choose Tracking % in the WatchList Tracking section to add a WatchList Column which will display the percent change from the Price that you set as a tracking value.

Adding & Editing WatchList Columns