Userform to just enter information that is refreneced to a cell

It is but what are you wanting to achieve from this?

Something like this?
C--Users-lfreund-Desktop-INPUT_v1.xlsm

Ok, so to answer your questions:

1.   Is there a way that the cell that I double click shows up on the userform so we know what PN we are seeing?

The answer is Yes.  However, where do you want to display the PN?  

2. The data that gets entered for each PN can it be seen every time it's being clicked on and not disappear when you exit.

What do you mean by this?  Are you wanting to store the data that you enter in the form in the table like below:

3.  The OK button on the userform does not work....

Correct.  We need to further clarify your requirements before touching this.

~Tala~

OK, all is fine except for:

2. when someone enters information for that particular PN since they will all be different that if the anyone was to open the file that they too can click on it and see what was entered.  The data can be stored on sheet4 for example.

Are you saying that PN 950-11111 could have more than one variation of Terms, FOB Origin and Quote Validation and that these will be stored on a different sheet?  I assume your objective is to maintain a list of Vendor Pricing schedules am I correct?

If your answer is Yes then you will need to allow for the storage of the data entered in your Form.

Great!  I will post up a revised version for you shortly.

Question :

Can you confirm that your list of PN's will remain the same or will it expand over time?