Which LOOKUP function to use and Keeping Formula Column Constant when Inserting Columns

Have a spreadsheet that another user helped me with a great function. I am wanting to tweak the function, but have not been able to quickly figure it out on my own.

Attached s'sheet shows 5 columns. The 5th Column (Check) locates a value from Column A from an array Columns D and E and then returns the difference in prices (sums) between Columns B and E. If there is no difference, it returns "Identical". If the string of text in Column A is not found, formula returns NA.

****I am wanting to do two things****
1. Move column F - the "Check" column over to column A.
2. I want to keep column A constant and have it work when, weekly, I insert two columns directly after column A with new weekly data. I looked in to using the "My Forumla" feature (Forumlas>Define Name), but could not seem to get it to work consistently.

Thank you so much!

Administrative Note:

@wendy823

Welcome to the forum.

We would very much like to help you with your query, however the thread title does not really convey what your request is about. Tell us what you are trying to do, not how you think it should be done.

Please take a moment to amend your thread title. Make sure that the title properly explains your request. Your title should be explicit and not be generic (this includes function names used without an indication of what you are trying to achieve).

Please see Forum Rule #1 about proper thread titles and adjust accordingly. To edit the thread title, open the original post to edit and then click on Go Advanced (bottom right) to access the area where you can edit your title.

(Note: this change is not optional. No help to be offered until this moderation request has been fulfilled.)

Yes, that's OK now.