Song show plus presentation slides

If you're talking about announcement slides or other highly-formatted ones, then you'd need to save them from SongShow Plus as images, then upload those images into Proclaim as media. You can then use the images to make slides in Proclaim.

If you're talking about song lyrics, see https://support.proclaim.logos.com/hc/en-us/articles/19864416819085-How-Do-I-Import-Songs-into-Proclaim.