[modeller_usage] Modeling loop using template from PDB file

Hello,

I have a structure (A) which is missing a stretch of a dozen or so residues. I also have the structure of the protein from a different organism which has said stretch of residues resolved (B). Now I'd like to take the coordinates of A and model the missing residues using the relevant coordinates (i.e. for these residues only) from B.

How would I go about doing this?

Thanks Markus