The custom selector string provided in the first image is: > pane[Class="XLDESK"] > pane[Class="ExcelGrid"][Id$="Budget2022.xlsx"] > pane[Id@="Budget[0-9]*"] > datagrid[Id="Grid"] > table[Name^="BudgetData"] > dataitem[Id="%‘A’ + RowIdx%"]

• Question 1: The selector uses Id$="Budget2022.xlsx". The $= operator means "Ends with." Since Final_Budget2022.xlsx ends with Budget2022.xlsx, the selector will still work.
• Question 2: The third pane uses Id@="Budget[0-9]*". The @= operator denotes a Regular Expression. The pattern Budget[0-9]* matches the word "Budget" followed by zero or more digits. Therefore, it will find a worksheet named exactly "Budget."
• Question 3: The dataitem ID is defined as %‘A’ + RowIdx%. In Power Automate, this expression concatenates the static string "A" with the value of the variable RowIdx, effectively targeting any cell in column A based on that variable.
• Question 4: Line 5 of the selector targets table[Name^="BudgetData"]. If the table name changes to Budget2022, the "Starts with" (^=) logic for "BudgetData" will fail. Thus, the user must update the table name in line 5.

Microsoft Learn (Official Vendor Documentation): Build custom selectors in Power Automate for desktop. Section: "Selector operators" (Defines $= as "Ends with", ^= as "Starts with", and @= as "Regular expression").

Microsoft Learn (Official Vendor Documentation): Use variables in Power Automate for desktop. Section: "Variable manipulation" (Explains expression evaluation and string concatenation using %).

Microsoft Power Platform Documentation: Automate Excel UI elements. (Details the hierarchy of Excel UI elements including Panes, DataGrids, and Tables).

Regular Expression Syntax (Standard): Understanding [0-9]* as matching a sequence of digits (zero or more) following a literal string.