Sure can! Our process is typically:
- Start with a new v13 .NET Core instance,
- create the page types you need,
- determine your design and implement that into your views,
- import data from the old site using the Kentico Xperience Import Toolkit.
To answer your question a bit more directly, there is NO direct upgrade/migration from any version of Portal Engine to v13. If you're using MVC in v11 and want to migrate to v13 MVC, there still is NO direct path to that either. Your best bet is to follow the 4 simple bullet points I shared above.