In case you have a pre-designed page that wishes to add to the funnel and not continue using our offered template, you can do it. All you need to do is remove the template and import the one you want.
Let's see how we can do it:
Step #1: Select the Step
Click on the pencil icon next to the page you want to change the template for.

Step #2: Remove the Template
Once the screen with the template open, locate the red Remove button at the bottom of the screen. Click on it to remove the existing template.

Step #3: Build from Scratch
After you've removed the existing template, you'll be shown a list of templates to choose from.

Choose the Build from Scratch from these options.
Step #4: Begin Editing
Click on the Edit button to open the Elementor blank page for you to work on.

Step #5: Open the Folder
On the page you will see an icon of folder. Click on it to open the importing options.

Step #6: My Templates
Once the screen opens, click on the My Templates tab from the top.

Here you'd find a list of all the templates you already have added in your folder. If you don't have the template you want, you can import one right now.
Step #7: Import a Template
Click on the import icon on the top of the page, to add the template you want to the funnel.

Important: Before you add any template, make sure that the JSON file is saved locally on the system you're working from.
Step #8: Select the File
You can drag-drop, or select the file you wish to import to the funnel.

Step #8: Insert the Template
After you've imported the template to the My Template list, click on insert to open it on the Elementor page editor.

And that's it, you're done!

Now customize your page and click on Update to save any of the changes made.

Congratulations! You just imported you own template to the funnel.