What are Global and Local(Action) Data Sheets in Data Table?
Data table stores data either in:
- Global sheet: Provides a source for values that can be used by any Action in the Test.
- ACTION sheet: Provides a source for values specific to an action.
Global Data Sheet: The global data sheet provides a source of values that can be used by any action in the test.

When you store the input data in a global data sheet, the complete test iterates for each row of data. Default iteration settings apply to all Iterations in the test.
Note: To set global data iterations from the QuickTest Professional menu bar, select FILE ? SETTINGS ? RUN.
Local/Action Sheet: When you use a local data sheet, values specific to an action appear in the action data sheets that are available to that action only. Default iteration settings in the action data sheets are specified for one iteration.

One should be very careful using the Global and Local data sheets.Tests may fail if you try to use Local data across the test.
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