Link subitem to its parent on creation
TL;DR: When a subitem is created, automatically populate a Connect-Boards column on the subitem with a chosen target. Use this to wire subitems to items in other boards (CRM, projects, accounts) without manual linking. The #7 most-used Subitem Automation in the app — used by 5% of all accounts.
What this does
Recipe: "When subitem is created, link it to its parent item using this logic."
Every new subitem gets its Connect-Boards column auto-filled based on the logic you choose — typically a connection back to its own parent item, or to an item in another board that matches a key.
When to use it
- Subitems need a live link to their parent for filtering, mirroring, or rollup
- Cross-board workflows where the subitem must reference a related item in another board
- Keeping a Connect column populated without manual entry on every new subitem
- Setting up Mirror columns on subitems that pull data from connected items
Before you start
- A Connect Boards column on the subitem (this is the column that gets populated)
- The connection target — typically the parent item, or an item in a connected board with a matching value
Set it up (2 minutes)
How to Auto-Link Subitems to Parent Items
Learn how to automatically link subitems to their parent items using a two-way connected boards column and custom automations.
May 26, 2026 By Kevin - Customer Experience Manager
This guide outlines how to automatically link subitems directly to their parent items using a two-way connected boards column and built-in automations. Setting up this link ensures that your subitem tracking stays perfectly synchronized with its high-level parent task.
This workflow is useful for project managers, team leads, and workspace administrators who need advanced rolled-up reporting or require subitems to behave independently while staying tied to parent records.
Create the Connect Boards Column
First, establish a relationship between the parent board and the subitems board.
1. On the Subitem level — add a Connect boards column.
2. Click Select boards and choose the board containing your subitems (the same board you're currently in).
3. Check the box for Set as a two-way connection, then click Connect boards at the bottom of the modal.
A two-way connection ensures that both the subitem and parent item will have a Connect Boards column which shows the connection.
4. If a notification appears asking if you want to create mirror columns, click I'll do it later.
Configure the Automation
Next, set up the automation that will populate this new column automatically whenever a subitem is created.
5. Click the Automate button in the top right corner of your board.Type "Subitem Automations" in the search bar and click the Subitem - All automations app.
6. Type "link it" into the search bar to filter the templates, then click Use template.
7. Click the word link in the automation builder sentence and select your Connect Boards column from the dropdown (the Connect Boards column itself is usually named after the board you connected it to).
8. Click the phrase this logic in the automation builder to configure how new connections are handled.
When configuring the connection logic, you have two options. Choose the one that best fits your workflow:
Add to existing connections
Enables multiple items/subitems to be connected via a single Connect Boards column.
This is ideal if you have multiple subitems in every item.
Override existing connections
Replaces any previously linked subitems with the newest subitem.
Use this if a parent item should only ever have exactly one active subitem linked at a time.
9. Click Create automation, then click the Close icon to exit the automation menu.
Test the Automation
10. Click + Add subitem under any parent item on your board. Type a name for the subitem (e.g., "Subitem 2") and press Enter. The automation will run and link the new subitem to the parent automatically.
Glossary
Two-way connection
A board configuration where linking an item on Board A automatically creates a reciprocal link on Board B.
Mirror columns
Columns that reflect data from one connected board into another, preventing double data entry.
Subitem
A nested row within a parent item, often used to break down larger tasks into smaller, trackable steps.
Common gotchas
- Fires only on creation. Existing subitems aren't back-filled.
- The Connect column must exist on the subitem first. If it doesn't, the automation has nowhere to write.
- The Connect column must point to the right target board. Configure the column's "connect to which board" setting before setting up the automation.
- Pair with mirror/rollup recipes for full cross-board sync — linking is the foundation, not the whole picture.
- For per-name linking rules (only specific subitem names get linked), see Smart rules & by-name automations .
Next up
Related
- Create subitems automatically (parent landing)
- Add parent name as a prefix to subitem names (companion default)
- Sync values between parent & subitem (sync data across the connection once linked)
Still stuck?