Using Netgear xtender to create wifi so ipad can connect to Windows 10 laptop w/out Internet

The extender wouldn't be the tool. 

You'd want something with a dhcp server like a router.  

If you're just using it for presentations and don't need internet, an old router might suffice. Or even a small travel router. 

have you tried that? 

You could even test it out at home with your home router by simply disconnecting it from your isp connection.