Table Footer is the bottom area of the Table. You can add a column in the Footer area, as similar to Table Header.
For Example: If you want to display column for Quantity in the Grid Table but its Total, in the Footer Area, Follow the steps mentioned below:
Create an Expression: You can add a simple expression in your bound table by following steps:

Fig 1. Expression
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Click on Table Header> Options>Item Details.
Then, select column for sale quantity and double click on it. Expression will be automatically added in your Expression Window.
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Fig 2. Add Column
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Add Condition using 'where' and add column from Bound column Tab. See the Window.
Press Execute Query or F5and See the Results.
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Fig 3. Expression Creation
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To get the Total Quantity add, sum before Sl_Total-Quantity.
Press Execute Query or F5and See the Results.
Click on Save Expression and give it a unique name. Press ok, a message will pop on your screen and select yes to Save.
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Fig 4. Insert Field
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Click on Connection(s)> Expression.
Select your expression and Right Click to to Insert Field.
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Your expression will be added. You can change the style and size of 'Font' from the option available at the top. See the window below:
Fig 5. Font Settings
Click on 'Save' to save your settings.

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You can See your Design by clicking on the Print Preview Option on Toolbar.
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Table Footer Preview:

Fig 6. Table Footer Preview