I don't mean a Presence Attack as such, but actually using only a limited amount of one's PRE.
This came from looking at this scan from an old Superman comic; Lana and Lois are trying to "disguise" Clark as Superman, and Superman (partly by dint of an excellent Acting roll, I suspect), is coming off as gawky ol' Clark, with a much lower effective Presence than Superman would have.
Somehow, giving a Superman or analogous writeup a base PRE of 10, with all the rest being bought with "Only in Hero ID" doesn't *quite* fit to me.
How would you folks do it?