Each Switch has to be individually paired. Anywhere you have a three way or four-way set up you need to install all of the switches for that light fixture at the same time. With GE switches, only the master actually gets paired to the smartthings hub, the auxiliaries are physically wired to the master via the traveler wires.
But every master switch has to be individually paired, if that’s what you’re asking.
If you are asking if you can do one master switch on Monday, then another master switch on Thursday, then three or four master switches over the weekend, sure, that’s no problem, again assuming that you do all of the devices for a three-way at the same time.
If you’re asking if you can wire all the switches at once and then go back and pair them individually then, yes, and some people do that when they have the switches installed by an electrician. The switches will work as physical switches even if they haven’t been paired yet.