Conditional formatting: Changing colors of cells based on reference cell values

Hello.

I have a sheet With several columns, from A to L, for various numbers, F and L which are important for what I want to do. The range is from 5 to about 200.

In column F, I have my starting point, and I use column L as a "final result" column. I have a basic formula duplicated in the range of column L, to compare it to F, however it takes LOTS of time to do this manually.

Apologies if the References to formatting functions and such doesn't sound right (I use a Norwegian install of 365).

Here is what I have done so far With conditional formatting:

*I basically used "Cell value EQUALS", and put in the entire range of the column to color the entire L-range green, if it is a match to F, of course this happens on a per cell basis (I also added a rule to ignore blanks).
*I used "Cell value NOT EQUAL TO" in order to color the entire L-range yellow, if it is not a match to F, still on a per cell basis. *****The first thing I would like to do, is to change this so that the coloring only happens if the values I'm comparing is within +/- 1% of the Reference value in F, but not an exact match.
***Secondly, I would like to change the color of the range to red if the difference is greater than +/-1%.

I know I can do it for each cell, I'm wondering if I can make a rule for the entire column to save lots of time. (will also help in the event of future updates to the sheet.

Hope this isn't too confusing.

Thanks,
TRS85