In the 18.4+e Enterprise edition, is it posible to copy/paste a set of sub-tasks?

I need to copy/paste a set of them in another sub-task of a higer  order.

For example:

PROYECT1 > TASK A > (SUB-TASK A1 > SUB-TASK A2 > SUB-TASK A3) COPY

PROYECT1 > TASK B > (SUB-TASK A1 > SUB-TASK A2 > SUB-TASK A3) PASTE

PROYECT1 > TASK C > (SUB-TASK A1 > SUB-TASK A2 > SUB-TASK A3) PASTE

THANK YOU IN ADVANCE!

-From Chile-