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There is no automatic way to find all external references that are used in a workbook, however, there are several manual methods you can use to find them.
You need to look in formulas, defined names, objects (like text boxes or shapes), chart titles, and chart data series.
However, when your data changes in Excel (typical business case: you receive the new period’s figures from your ERP system), you need to update all the tables and charts in Power Point without making any mistakes.
I've created a program for a client where there are a number of charts in Excel - and have them linked to powerpoint files (on both Windows and Mac).
If you duplicate your Excel file, the link will be broken with the new version.
Also, note that the update is not available when pasting tables.
The Power Point presentation of June remains linked to the Excel source file of May.
You won’t be able to update your presentation with the duplicated Excel file.
It's if you change the number of columns (say have 3 years or 7 years instead of the starting number) - it doesn't update.