You cannot have two non-immigrant status at the same time. You can either be on OPT or H1B, but not both. Normally, people get OPT first then go to H1B. You can get directly to H1B if your employer is willing to do so for you.
Although H1B is also calssified as dual status, that only means you can have immigration intent while you are holding non-immigrant status like H1B. Not like F1, you cannot have immigration intent at all.
Although H1B is also calssified as dual status, that only means you can have immigration intent while you are holding non-immigrant status like H1B. Not like F1, you cannot have immigration intent at all.