Know catalog modifications.
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Get there: More > Tools > Catalog > Automatic item modifications by age
This tool allows librarians to update item specific fields when an item reaches a certain age.
If you haven't created any rules you will see the option to 'Add rules' on the Tool page. Click this button to create rules.

If you have rules already there will be a button that reads 'Edit rules'. To create a new rule click the 'Edit rules' button at the top of the page

You will be brought to a page where you can edit exisitng rules or create a new rule

In the form that appears you can set :
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the age in days at which the item will update (Age)
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what criteria is needed to trigger the update (Conditions)
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what changes are made when the script runs (Substitutions)

Once you're done you can click the 'Add this rule' link and then add additional rules or you can click the 'Submit these rules' button to save your changes.
