Moving the website or funnel from one project to another is easy.
Go to the Funnels and Websites section of your builder -> Go to the top of the website or funnel you want to move and click on the 3 dots on the right.
Click on the 3 dots on the right and select the “Move to another project” option.
You then have the option to create a new project with this website or funnel, or move it to an existing project.