Hi there!
stuck in the following situations...

1. How do I append a command after an argument?
   example:

cmd looks like: ip igmp snooping vlan <VLAN-LIST> mrouter interfaces <INTERFACE-LIST>
 - ip
 - igmp
 - snooping
 - vlan
 - VLAN-LIST --> argument here
 - mrouter
 - interfaces
 - INTERFACES-LIST --> argument here

2. command and argument can't be at the same depth?
   example:

•  VLAN
   - <VLAN-LIST> --> this is arguments for VLAN
   - default-vlan --> this is a sub command of VLAN command
  

I would appreciate any feedback! Thank you!