How to Add and Use Relation Fields in My Notion Database (Main Guide)?
Relation fields in Notion let you connect two databases — like linking a Task to a Project or a Contact to a Company. When used with NoteForms, this powerful feature unlocks dynamic form behavior, such as selecting, creating, or editing related entries all from one interface.
A relation field links one Notion database to another, allowing you to display and interact with data across connected sources.
Example:
A “Tasks” database can have a relation field to a “Projects” database, so you can assign each task to a project and retrieve project details in context.
Open your Notion database (e.g., Tasks).
Click + Add a Property and select Relation.
Link it to another database (e.g., Projects).
Choose whether to make it a one-way or two-way connection.
Give the field a clear name (like “Project” or “Client”).
Once done, you’ll see the relation field in your database and can use it inside your NoteForms.
Here’s how you can maximize your use of relation fields within your forms:
Show a Dropdown of Related Items
Display a list of entries from your connected database.
→ To customize which columns appear in this dropdown, learn how to configure displayed properties.
Allow Users to Create New Related Entries (Sub-Form)
Enable users to add a new item in the related database directly from your form.
→ *See: How to allow creation of new relations in my form (sub-form)
Allow Users to Edit Existing Related Entries (Sub-Form)
Users can modify an already-linked item (like updating a contact’s info) directly from the form.
→ *See: How to allow editing of relations in my form (sub-form)
Apply Filtering to the Dropdown
Show only the most relevant options — like available items, active users, or current projects.
→ *See: How to filter options in my Notion relation input field
Ensure both databases (the main and the related one) are shared with NoteForms.
The relation field must be properly configured and visible in your Notion workspace.
For issues with missing relation fields, refer to:
Where is my relation field/column?
⚠️ Sub-forms for relation creation and editing only work with forms created after June 18, 2025.
🔗 What is a Relation Field?
A relation field links one Notion database to another, allowing you to display and interact with data across connected sources.
Example:
A “Tasks” database can have a relation field to a “Projects” database, so you can assign each task to a project and retrieve project details in context.
🛠️ How to Add a Relation Field in Notion
Open your Notion database (e.g., Tasks).
Click + Add a Property and select Relation.
Link it to another database (e.g., Projects).
Choose whether to make it a one-way or two-way connection.
Give the field a clear name (like “Project” or “Client”).
Once done, you’ll see the relation field in your database and can use it inside your NoteForms.
🚀 What You Can Do with Relation Fields in NoteForms
Here’s how you can maximize your use of relation fields within your forms:
Show a Dropdown of Related Items
Display a list of entries from your connected database.
→ To customize which columns appear in this dropdown, learn how to configure displayed properties.
Allow Users to Create New Related Entries (Sub-Form)
Enable users to add a new item in the related database directly from your form.
→ *See: How to allow creation of new relations in my form (sub-form)
Allow Users to Edit Existing Related Entries (Sub-Form)
Users can modify an already-linked item (like updating a contact’s info) directly from the form.
→ *See: How to allow editing of relations in my form (sub-form)
Apply Filtering to the Dropdown
Show only the most relevant options — like available items, active users, or current projects.
→ *See: How to filter options in my Notion relation input field
✅ Requirements and Notes:
Ensure both databases (the main and the related one) are shared with NoteForms.
The relation field must be properly configured and visible in your Notion workspace.
For issues with missing relation fields, refer to:
Where is my relation field/column?
⚠️ Sub-forms for relation creation and editing only work with forms created after June 18, 2025.
Updated on: 24/06/2025
Thank you!