"Inbox" is the main bucket that your all travel request gets stored, which is raised by your team and yourself.
to Approve or deny, which is raised by your team member.
"Team Trip" This is main bucket that your all request gets stored to Approve OR Deny, which is raised by your team member.
"My Trip" This is main bucket that your all request gets stored, which trip raised by yourself, and you can manage Booking / expense claim from there.
"Draft" Your travel request will be show into bucket, which has planned business travel but did not submit to approve.