[modeller_usage] modelling heterodimer.

Dear all, I am new to such a wonderfull software. i have a question regarding the modeller usage.

i want to modell a heterotetramer i.e protein complex formed by two homodimeric proteins. is there any way that i could do it using the modeller.

if this is not possible please let me know if there is a way to model homodimers or heterodimers using modeller.

thanking you.