Assuming you open a long position with bitcoin at $90000, you will see the position as 1.
Also you open bitcoin long position at $91000, you should see the position as 2.
I means same coins with 2 positions. Just as if you open bitcoin as position 1 and another coin as position 2.
On most exchanges, the bitcoin amount you used to open 1st and 2nd position will add up as just only one position.
The reason I asked this question is because I want to try grid trading and this is how it can be convenient for me on a single exchange.
You can not if you use only one account.
It's possible if you use multiple accounts on one exchange, like you use a first account with trading positions used x2 leverage; a second account for trading positions with x5 leverages; and a third account with trading positions used x10 leverages.
By using different accounts and different leverages, you can manage your entry and exit as well as risk better. I mean you can calculate your entry, exit and liquidation price better, but this method contains risk of exchange policy. Using multiple accounts are likely not accepted by their ToS.