# Use Indirect Tag functionality in Expression binding

**URL:** <https://forum.inductiveautomation.com/t/use-indirect-tag-functionality-in-expression-binding/10175>\
**Category:** Ignition\
**Created:** [June 25, 2015, 2:22pm UTC](https://forum.inductiveautomation.com/t/use-indirect-tag-functionality-in-expression-binding/10175 "2015-06-25T14:22:17Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [June 25, 2015, 2:22pm UTC](https://forum.inductiveautomation.com/t/use-indirect-tag-functionality-in-expression-binding/10175/1 "2015-06-25T14:22:17Z")

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Hi,

I’m new to Ignition and still getting my head around how everything fits together.

I’m trying to work out how I can have the functionality of Indirect Tag binding in an expression.

For example, I would like to use the following expression:

```auto
"<HTML><B>" + {{Root Container.TankSelectionGroup.AreaSelection.selectedStringValue}/{Root Container.TankSelectionGroup.TankSelection.selectedStringValue}/Temperature/Process Variable}
```

Where TankSelection and AreaSelection are both drop down menus.  
The expression, for instance, should evaluate to something like:

```auto
"<HTML><B>"+{Vintage Tank Farm/Tank 560/Temperature/Process Variable}
```

This expression doesn’t work however as expressions don’t support nested paths. Is there a function or other syntax that I can use to get around this?

Thanks!

Nick

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<div class="post-metadata">

**Author:** ![nmudge](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nmudge/32/3394_2.png) [@nmudge](https://forum.inductiveautomation.com/u/nmudge)\
**Post date:** [June 25, 2015, 2:31pm UTC](https://forum.inductiveautomation.com/t/use-indirect-tag-functionality-in-expression-binding/10175/2 "2015-06-25T14:31:03Z")

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Hi Nick,

You can use the [tag expression function](https://support.inductiveautomation.com/usermanuals/ignition/index.html?gen_advanced_tag.htm) to build up paths to components in expressions.

Best,

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<div class="post-metadata">

**Author:** ![antoniosantos\_ccb](https://avatars.discourse-cdn.com/v4/letter/a/e0b2c6/32.png) [@antoniosantos\_ccb](https://forum.inductiveautomation.com/u/antoniosantos_ccb)\
**Post date:** [November 18, 2017, 11:05am UTC](https://forum.inductiveautomation.com/t/use-indirect-tag-functionality-in-expression-binding/10175/4 "2017-11-18T11:05:53Z")

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How can I use Historical Tag with calc?  
I need to divide the values by 10.