Many of the older mining software, like cgminer, had a "balance" option that would allow you do split hash between pools. It never worked particularly well.
I recall one of the first times I used the forum was investigating how to do this splitting of hashrate, and it involved either an Antminer S1 or S3, don’t remember now. Ever since the S5 or S4 I think they removed this function from all Antminers.