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Power Apps - Building Power Apps
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Dynamic value for sum of selected items for a model driven app

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Posted on by 96
Hi folks,
 
Does anyone know a way to show the sum of values for a column in a Model-Driven App for only the selected items? 
 
For example, in the following view, I would like to get the sum of the Accommodation cost for only the selected items, which is $690. However, so far I can only get the sum of all the items, which is $1,035.
 
 
 
I feel like this should be easy but I'm stuck. 
 
As a temporary workaround I have included a canvas app page in my app which adds the selected items to a collection and then does the calculation but I was hoping to keep everything in the standard model-driven app so I have a consistent user interface. 
 
Thanks in advance for any help and ideas!
Kat
 

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