Want to create a chronological row # then reset based on font color

I want to create a column that numbers itself chronologically based on the column to its left based on font color. Then when a new font color appears in the column, I would like it to reset and then number the rows again. Pretty much create a line item column.

I found a code that kind of worked but it wasn't what I needed.

I tried other codes but nothing I found worked.

You could use this function to test the font color:

Option Explicit
Function TextColour(RG As Range)
    Application.Volatile
    TextColour = RG.Font.Color
End Function

Then use it like this:

Example: