@harirajmohan .Just checked with the cbsa at Champlain border, the officer there says , even if you stay in US for 10mins and return you need to quarantine after coming back. I told him that i will be travelling there for my work purpose and would return on the same day.1. They allow personal trips on H1 while we still on employment in US. No issues. You dont need separate b1 visa for that. But now i dont know if they still allow other than essentials due to canada-US restrictions for the time being. You need to check on that if you are going for personal trip.
2. If you return to Canada from the work trip then they wont ask you to quarantine. cbsa will ask on why you went, where you went, where do you work, title etc. So based on that they will determine if you need quarantine but till now they never asked me to do it in the last 5 times.
Is this something left to cbsa officer's discretion or was that rule imposed. i am not sure!!