Is it possible to disable chrome's auto URL suggestion temporarily which I can use during presentations meetings where I dont want to show my previous history when I start typing office website in the address bar?
You can use Guest profile feature available in Google Chrome.
When friends and family members browse as guests on your computer, none of their browsing history or cookies are saved. They also can’t see or change your Chrome information or settings.
This should enable you to use Google Chrome during presentations or meetings while keeping your browsing history private.
To browse as guest:
I don't think it's possible. If you use your computer for both business and personal use, you really should have different user accounts. Or simply use two different browsers, one browser for personal, another for business. If you're familiar with SQLite, you can check this answer which explains using SQLite browser to manually delete auto-complete suggestions.