unable to see Extends option on a custom table created.

[Imlearning]

I am trying to create a new table while learning in my PDI(Yakohama version)

I could not see the option to allocate or assign this to another table(Task) as a child.

Extends option is not visible, any reasons?

Thanks in advance

[Nehal Dhuri]

Hello @Imlearning ,
Please refer to the following community post.
https://www.servicenow.com/community/developer-forum/extending-a-table-in-servicenow/m-p/1360534
If this is helpful for you, please mark my ANSWER as CORRECT and HELPFUL 

[SumanthDosapati · Accepted solution]

@Imlearning 

Did you save the record already?

If yes, you can't extend it now. 

Regards,

Sumanth

[Siva Chandu]

Form Layout Changed (UI Policy or View Issue)

The "Extends table" field might be hidden due to a UI Policy or you’re not on the right form view.
Fix: Click on the gear icon (Form Designer or Form Layout) and add the "Extends table" field manually to the form.

Module or Role Restrictions

Some PDI environments may limit system-level capabilities depending on your user role.
Fix: Make sure your user has the admin role.

Trying to Create a Scoped Table (Application Scope Restriction)

If you're inside a scoped app, and the scope is restricted, some platform features like "Extends" may not be exposed directly.
Fix: Switch to Global scope temporarily and check again.

Creating the Table via Studio (Limited Options)

If you’re creating the table via Studio, the form might not show all fields like "Extends".
Fix: Try creating the table from System Definition > Tables instead.

Browser or UI Glitch

Sometimes the PDI UI doesn’t fully load or glitch.
Fix: Try refreshing the page or using a different browser.