Sum Based Upon Cell Color - Multiple Times

I have a workbook with a tab called "parts list" where there are thousands of parts with prices. I need to sum all of the parts based upon their location within the list. The list is divided with the following headers - Yellow (Assemblies), Gray (Sub-Assemblies) there can be many under a yellow header, and Green (Components) there can be many under a Gray header.

I have been summing the areas manually, and I am hoping for a more automated way of creating the totals by running a macro.

I need to sum (Column K) from Yellow+1 to Yellow-1 and deposit the sum in the starting Yellow row - Column L. This needs to be repeated for as many Yellow Headers as there are in the list. I then need to repeat the process for Gray Headers - Col K, Gray+1 to Gray-1, and put total in starting Gray header, Column L. Once again, there can be many Gray Headers under a Yellow header, and this needs t be repeated throughout the list. I then need to repeat this for the Green Headers - same as above Gray. I am hoping that this can be done by color, but if it's easier, I can sort the list by color and in column M, add an "A" to all Yellow Headers, "S" to all Gray Headers, "C" to all Green Headers, and "E" to represent the end of the component list -