Trying to make one object follow the curve of another.

So I’m trying to make a helmet, I’ve got the majority of it down.

I just need to connect it to the visor edge which I’ve made already.
So what I would like to know is how can I get the visor edges to curve in the same fashion as the rest of the helmet?

For questions like this you really need to give more info. Always attach your blend file so other users know what your specific model is like. Most screenshots are only a little more useful than pointless

I’ve tried uploading the file and had no luck with it.

Here’s the reference I used for the helmet.

I’m trying to to connect the vertices that make up the edges of the…crack, to the rest of the helm. I want to know if there is a way I can use that will quickly and efficiently bring the vertices of the crack into line with the helmet’s vertices.

Try the Loop-tools addon Bridge.
And upload your blend here :

Okay I’ve uploaded my file. Here’s the link.