How to start a shell into an already existent screen

I start a screen with

screen -dRS Test myshell.sh run1

It's possible start another my program (myshell.sh run2) on same screen
identify by "-S Test", like when I do a "C-a c" screen command and I
can list with C-a "?

Many thanks for reply

-- 
Dario Lesca
(inviato dal mio Linux Fedora 32 Workstation)