You can add Sketchfab embeds to projects in your Behance portfolio.
Step-by-Step Guide: Embedding Sketchfab Models in Behance
Copy the Embed Code from Sketchfab
Go to your model page on Sketchfab and copy the embed code.
Open the Behance Project Editor
Open an existing project or create a new project in Behance.
Add 3D Content
Select 3D from the list of content types to add.
Embed the Model
Paste the copied embed code into the embed code field and click Embed.
And that's it! Now you can continue editing the project as needed.