Visa process B2 H4

Hi All good day! This might be very silly question i am So new to usa visa items, please help me on the following .

  1. Can we apply b2 visa and H4 visa at the same time.
  2. Currently i applied for b2 visa for me and mom but slot given is 2024 i tried to apply a new but i checked in CGI federal there is no option to create another application.
    Very silly questions but please help me.

How is the waiting time for H4 in Chennai location?

You can if yoy qualify for H4 which is dependent visa of H1B holder.