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Yes. Just be sure not to actually send your model trades to Tradier.

Yes. In the Monitor Grid screenshot I've shown above, the BX trade is actually a paper trade. The others are real trades imported from TD Ameritrade. In all cases, they use real time prices from Tradier.

If you haven't familiarized yourself with ONE, it would help to do that. The explanation below assumes that you're not that familiar with ONE (if you are, pardon my assumption). Once you set up (model) your trade in ONE, you can "Commit" it. This offers you the choice of sending the modeled trade to Tradier, or simply "saving" it into ONE. By "saving" it, it doesn't actually get exectuted by the broker; rather, it gets added to your list of trades. ONE has a "Monitor Grid" which can be used to watch all your trades. .Subsequent adjustments to the trade can be made similarly, but by being sure to select an existing spread while "Committing" the modelled trade. You can go back and look at the trade details in the Trade Log, or in the Reports.