I have Xamarin.Forms project Visual Studio 2017 in Windows 10 PC. My VS connected to mac machine over the network. I want to create IPA file from Xamar
Here is a blog on (How to create *.ipa file in Xamarin Forms) :
https://xamarindevelopervietnam.wordpress.com/2016/05/12/how-to-create-ipa-file-in-xamarin-forms/
However I would also prefer you to look into CD CI. Continuous Development and Continuous Integration system. This will help you not only to build the .apk and .ipa for your xamarin projects but also provides you the efficient way of build distribution.
There are several tools available based on your version control. Please check these links :
https://devblogs.microsoft.com/xamarin/continuous-integration-for-ios-apps-with-visual-studio-team-services/
https://docs.microsoft.com/en-us/xamarin/tools/ci/intro-to-ci
There is a video illustration of doing this in visual studio :
https://www.youtube.com/watch?v=P9cOCEuuEOE