How to automatically list down associates if workflow is mentioned in the column?

[jhajee]

How to automatically list down associates if workflow is mentioned in the column?
Like in attached sheet, in column B workflow is listed down and in column C name of associates should get populated in sequential manner from column F, G and H.
For example A, B, C and D is aligned to workflow X (Treating this as primary source), whenever in column B, workflow X is populated (manually) it should list down list of associates in order - A then B, then C, then D; once cycle completes, it should repeat again A, B, C, and D.

Regards,

Jhajee

[AZ-XL]

Hi
F3 cell =
=IFERROR(INDEX($C$2:$C$20,SMALL(IF(F$2=$B$2:$B$20,ROW($B$2:$B$20)-1,""),ROW()-2)),"")

Then enter Ctrl+Shift+enter instead of just an enter, Drag right and down