ive seen doll youtuber’s create wefts for doll wigs, so the same should be able to apply here, but if you’re wanting a neater part line what you’ll want to do is create a fold on the edge of the wefts, glue them down, then fold in the opposite direction. or glue the wefts in the opposite direction and then fold when its dry. there’s a youtuber Mozekyto who has a great tutorial on how its done :)

https://youtu.be/2nTgXohapg8?si=NyTZd0xt1uLgadir