[modeller_usage] arranging individual subunits

Dear Modeller users, I have made separate individual models of subunits of a multimeric protein.can any body tell me how to assemble the subunits into one structure (like its template), having the same rotational angles of the template?is it possible at all? or if this can not be accomplished in Modeller, suggest me a program,software, etc. thank you in advance;