Your question is a little confusing but I believe you are asking if a remote user is at home, they use Windows Update but in office they use BigFix?
First, if you are going to use windows update, your control of when patches deploy is more difficult to control.
We patch 30,000 + systems with several thousand remote systems and use Internet Facing Relays to make this work. When a user is in the office, they patch using our internal relays and when they are remote, they use our internet facing relays.