| Customizing a system > Working with schemas > Adding Extension and Child schemas

Adding Extension and Child schemas

An Extension schema has a one-to-one relationship with its associated Main schema [>>]. A District Administrator can add a custom Extension schema to a Main schema and to custom Child schemas; however, he or she cannot delete a custom Extension schema if it is referenced by a page in another schema in the database, nor can he or she change a built-in Extension schema, or add one custom Extension schema to another.

A Child schema has a one-to-many relationship to the Main schema. Fields in a Child schema appear as a grid on the page. The administrator can add a Child schema to a main schema and to another custom Child schema, but cannot add a Child schema to an Extension schema, change a built-in Child schema, edit or delete a Child schema that is locked [>>], or change a Child schema that is referenced by a page in another schema.

To add an Extension or Child schema [DA]:


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