Hello , I Have A Integer Variable In Widget A And I Wanted To Edit (Set) Him From Widget B How Can Do That Please Help ! 
As long as you have a reference to the widget that has the variable you should be able to set the values of the other widget’s variable. When you create a widget the return value returns a reference to that widget, so if you save the reference into a variable you should be able to change the variables by simply drag the set of the variable from the variable that contains the widget.
Really should work like is is the widget B (unless the variable BUY is empty)
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Thanks !!!