# Parent UDT passing parameter to Child UDT

**URL:** <https://forum.inductiveautomation.com/t/parent-udt-passing-parameter-to-child-udt/63572>\
**Category:** Ignition\
**Created:** [August 29, 2022, 6:14pm UTC](https://forum.inductiveautomation.com/t/parent-udt-passing-parameter-to-child-udt/63572 "2022-08-29T18:14:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Brad\_Medley](https://avatars.discourse-cdn.com/v4/letter/b/82dd89/32.png) [@Brad\_Medley](https://forum.inductiveautomation.com/u/Brad_Medley)\
**Post date:** [August 29, 2022, 6:14pm UTC](https://forum.inductiveautomation.com/t/parent-udt-passing-parameter-to-child-udt/63572/1 "2022-08-29T18:14:52Z")

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I am having trouble passing a Parent UDT parameter into a child UDT.

The parent Parameter is {TwisterNumber}. It seems to break the pathway to the tag when I insert the Parent Parameter or even create a Child Parameter referencing the parent parameter. {Parent\_TwisterNumber} = {TwisterNumber}

![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/3/63133c74bdf0b896be7e07e4dd1b11a4e3209482.png)

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [August 29, 2022, 7:57pm UTC](https://forum.inductiveautomation.com/t/parent-udt-passing-parameter-to-child-udt/63572/2 "2022-08-29T19:57:22Z")

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You cannot ever nest curly braces. This is one of the few cases where the `tag()` expression function is appropriate.

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<div class="post-metadata">

**Author:** ![Brad\_Medley](https://avatars.discourse-cdn.com/v4/letter/b/82dd89/32.png) [@Brad\_Medley](https://forum.inductiveautomation.com/u/Brad_Medley)\
**Post date:** [August 29, 2022, 9:09pm UTC](https://forum.inductiveautomation.com/t/parent-udt-passing-parameter-to-child-udt/63572/3 "2022-08-29T21:09:32Z")

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Thanks! That worked wonders.

Just pasting results here. In case this helps someone else in the future.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/f/9f39ff47d81453f3d2d9ceb0d0b883715a03dbab.png)