Run multimer with a "single receptor" and "multiple partners"

Hallo all,

Let's say that I have a protein to which I would like to dock multiple different proteins but always in a 1:1 ratio.
there is a way to provide a list in the fasta file so that the first protein (receptor) does not require to be re-calculated?
e.g. protein A with proteins B, C, D, E....

I hope my question was clear and that someone has a good suggestion

Thank you!