DSADD user -memberof usage

I want to add a particular user on my Domain to Multiple groups using DSADD user command. I tried doing the same doing this:

DSadd user "CN=Last\, First,OU=AB,DC=Xyxyxyx,DC=Com" -pwd Password -samid
First.last -fn First -ln Last -empid 12345 -display "Last, First" -loscr
Script.vbs -upn First.Last@Xyxyxyx.com -memberof "CN=.Abc
Def,OU=AB,DC=Xyxyxyx,DC=com"

But it only allows me to add a new user to one group at creation time. Can anyone please tell me what the correct syntax for using DSADD user command is? Thanks in advance,

You are correct to far extent but there is a small mistake. You will need to separate group distinguished names with spaces. For example (watch line
wrapping, it usually wraps at spaces):

dsadd user "CN=Last\, First,OU=AB,DC=Xyxyxyx,DC=Com" -memberOf
"cn=group1,OU=AB,DC=Xyxyxyx,DC=Com" "cn=group2,OU=AB,DC=Xyxyxyx,DC=Com"

All values up to the next dash "-" are taken as group distinguished names.

I think you are right. Microsoft should better update their help, because there written that DN's must be separated with ";".

Thank you very much for the help LeonL. That did the trick, it seems obvious now and I did try a few variations but not that one.