Seeking VB string for hiding rows in excel

Greetings,

I am trying to develop a VB string to automatically hide/unhide rows based on a predetermined letter value. My excel spreadsheet has many rows that will either have an "A," for Allowance Costs - with a description and cost, or any other letters representing Fixed Costs, that are not pertinent for my worksheet. All rows are linked from a separate spreadsheet. Any of the rows with "A" need to be seen, while all the others need to be hidden. I would like it to automatically hide/unhide the rows based on the previous specifications, because the "A's" can change based on customer changes.

Below is how the spreadsheet is set up:
A60:A226 is the description linked to another worksheet
J60:J226 is the value linked to N60:N226
M60:M226 is the "A" or other letters linked from another worksheet
N60:N226 is the value linked from another worksheet

Any help with this VB string would be greatly appreciated. I have been working on this for a few hours each of the past 2-3 days without luck figuring it out...

Thank you very much.