How to sum a Gallery Column

[CaiChicken]

Hello Community,

This question might be asked many times but my case is a bit complex

I need to Sum up Total Price, 

The formula for Total Price is 

ThisItem.'Trade Price'*SearchCart_TextInput_Quantity.Text*(100-SearchCart_TextInput_Discount)/100

Item list from this gallery is from a Collection where each items are manually added (Not a filter).

And it is a nested table (This is another issue I encounter, not very sure how to convert to normal table)

Any help appreciated,

Thanks in advance.

[CaiChicken · Accepted solution]

Solution Found! 

Sum(ImportCart_Gallery_Cart.AllItems, ImportCart_Label_TotalPrice)

[mdevaney · Accepted solution]

@CaiChicken 

Is the Total Price being displayed using a label called Import_Label_TotalPrice?

If yes, please put this code in the Text property of a new label to display the SUM.

Sum(    
    AddColumns(
        Gallery1.AllItems,
        "TotalPrice",
        Value(Import_Label_TotalPrice.Text)
    ),
    "TotalPrice"
)

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