# Nested Templates

**URL:** <https://forum.inductiveautomation.com/t/nested-templates/9805>\
**Category:** Ignition\
**Created:** [March 16, 2015, 5:53pm UTC](https://forum.inductiveautomation.com/t/nested-templates/9805 "2015-03-16T17:53:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Loomisman](https://avatars.discourse-cdn.com/v4/letter/l/ad7895/32.png) [@Loomisman](https://forum.inductiveautomation.com/u/Loomisman)\
**Post date:** [March 16, 2015, 5:53pm UTC](https://forum.inductiveautomation.com/t/nested-templates/9805/1 "2015-03-16T17:53:04Z")

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I am trying to nest a template (Small Template) within a template (Big Template). I also have a UDT that contains other UDTs. I would like to pass a parameter UDT to the Big Template and be able to then pass one of the embedded UDTs as a parameter to Small Template. Is this possible?

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**Author:** ![wdreynolds1](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/wdreynolds1/32/3327_2.png) [@wdreynolds1](https://forum.inductiveautomation.com/u/wdreynolds1)\
**Post date:** [March 22, 2015, 3:49pm UTC](https://forum.inductiveautomation.com/t/nested-templates/9805/2 "2015-03-22T15:49:19Z")

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Yes… it is possible but not the recommended approach. You might experience performance issues on window open. You want your templates to reference tags… not UDTs. When a template or any container references a tag, it only subscribes to the fully qualified path. However, when a template or container references a UDT, it subscribes to all of its children as well. For nested UDTs or UDTs with many children, this can cause significant performance issues.

Walker