I would use the plug-in Create Coda System.

Plug-ins menu > Measures > Create Coda System…

Simply using the hide and show functions you can do this. However, I can not figure out how to show the group brackets again.

Perhaps some one else can tell us how to do that if it is possible.

… I can not figure out how to show the group brackets again …

You get brackets if you use the Create Coda System plug-in.

It's worth mentioning that the usual purpose of incipits is not just to show the original clefs, key sig and mensuration symbol, but also the first note of each staff in its original duration, to indicate both the transposition and reduction in note values, if any; and the original names of the staves, e.g Cantus, Sextus, Altus, etc.

PETER THOMSEN can you walk me through how to use the plug-in? I'm only able to figure out how to add a coda symbol, the words "coda," and their correlative "...al coda" designations. Thank you!

The coda plug-in does work. I don't use it but since it was suggested as a solution I find it does do what you want. It, again, is a testament of what the genius plug-in creators do that Finale should do natively. However, you can do the same thing just using the hide and show functions in Finale. I remedied the bracket showing by some system measurement adjustments.

To use the coda plug-in which is located in the Measures section of plug-ins, select the first measure or any measure you want the system break to be.  You will get this...........

You will need to do some additional work on it like deleting the repeat texting. Remove the barline in the first measure, hide notes or rests and change the clef in the new system. Also, check hide cautionary clefs and check show time sigs.

The same thing can be done in Finale by using the same hide and show abilities and adjusting the margins. You get this....

If you need to show the first pitch you can do that by not hiding notes in the original clefs measure.

Since either of these methods require several steps I would do it once and make a template to use on future projects.

FYI:

A plug-in only does what you can do yourself, manually”, with Finale.

Only the plug-in does it faster.

The plug-in Create Coda System does its trick by positioning two systems next to each other.

To get two systems next to each other you must de-select Avoid Margin Collisions in the Page Layout menu.

This step allows for negative values in the system margins.

… PETER THOMSEN can you walk me through how to use the plug-in? I'm only able to figure out how to add a coda symbol, the words "coda," and their correlative "...al coda" designations. Thank you! …

Raul Dominguez,

I think that Ernest Biggs has explained quite well how to use the plug-in.

Let me know if you have questions about this,

Peter thanx for the tip on the Coda plug-in. I had forgot it was there. I stopped using many of the plug-ins after Perfect Layout came on the scene. The three I still use all the time are PL, JW  Change and JW Polyphony. My thinking is, what happens when there aren't plug-in developers or they don't get updated?, So, I try to do what I can without them. JW doesn't seem to be in the mood to update his wonderful plug-in set any longer. So far not a big deal except some incompatibility with smufl fonts.

"A plug-in only does what you can do yourself, manually”, with Finale.

Only the plug-in does it faster."

Certainly a valid point and a blessing in some cases. Another great plug-in is Patterson Beams, BTW.