How to Import New Forms In Visual Studio?

Import? Not quite sure what you mean by that...

But there are two basic ways to add a form to your project:
1) Right click your project in the Solution Explorer, and select "Add"..."Windows Form". Give the new form an appropriate name in the dialog that appears, and press OK. This will add a new, blank form.
2) Right click your project in the Solution Explorer, and select "Add"..."Existing Item". This will bring up a dialog allowing you to browse to the location holding the form(s) you want to add. Select the YourFormName.cs file, and press "Add". VS will add a copy of the file for the form (including the designer files) to your project folder and add it to your project.