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Filtering LookUpColumn values of SharePoint list based on a dropdown selected value



I have a sharepoint list A which contains a lookup column which looks at SharePoint List B's number column. Both lists contain a column "type" which is a choice type and has two choices in it.

I need to create a newform on PowerApps from List A where when a user selects value for type, the lookupcolumn values only show those which are having that type.
At present I have the dropdown as DDType. I need to filter the combo box Items to only show the values which have DDType.Selected.Value.
I am trying to use this formula on Items as Filter(Choices('List A'.ColumnName), Value in Filter('List B',Type.Value = DDType.Selected.Value).BColumnName).


Please Help!


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