At the Porsche store, can you sit in a Porsche, even if you not will (and cant) buy one?

If they are not uptight and you are not a jerk they just might let you.

Can you? Sure, until they ask you to leave. Car dealerships are there to sell cars. If you are not a serious shopper or can't afford the vehicles - stay away from them.

@F

door of car of showroom? not because of COVID 19?

Maybe .Might even let U test drive. I test drove  a Miata and Fiat 500.The Chevy dealer wouldn't let me test drive a Corvette.

  The  Indian and Harley dealer  let me test ride,  when I signed a waiver.

Probably not. There’s an area between London’s Regent Street and Piccadilly, around New Bond Street, where there are loads of upmarket car showrooms. Bugatti, Ferrari , Lamborghini , Bentley, Rolls, Aston Martin etc etc, and they all have “Entry by appointment only” signs in the door. 

Ask the salesperson.

i wouldnt do that

Yes you can't....

You can, but they won't like it.

Not every Porsche dealer in the world will operate by the same rules.

Why not call up your local Porsche dealer and ask...