Use the Admin Preferences dialog box to specify default settings. Click Admin, Admin Preferences.
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Data Limits:-
Use the Data Limits tab to specify the maximum number of levels for hierarchical structures. You can also specify the maximum number of baselines and activity codes that can be included in a project.
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ID Lengths
Use the ID Lengths tab to specify the greatest number of characters for IDs and codes.
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Time Periods:-
Use the Time Periods tab to set the default number of hours in a workday, workweek, workmonth, and workyear. These values are served as conversion factors when displaying the time units and duration display formats you Click. Abbreviations can also be used for displaying minutes, hours, days, weeks, months, and years.