My Goal - I want to create eCommerce tracking funnel.
So here I am confused should i create property for this https://app.clickfunnels.com ?
If you can add the Google Analtyics Tracker to app.clickfunnels then you'll want to implement cross domain tracking on one unified property.
More on cross domain here:
Once you do that, all pageviews on both sites will collect and your attribution will be preserved.