Adding a new field to all records
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In the action menu, choose Add.
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In MARC Tag, type the MARC tag number.
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Leave the Subfields field blank.
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In MARC Data, type the field you would like to add.
 
Delete a field if it contains a particular string
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In the action menu, choose Delete.
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In MARC Tag, type the MARC tag number.
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Leave the Subfields field blank.
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In MARC Data, type the field you would like to add.
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In the subfield field under Advanced Matching Restriction, type the subfield code where you expect to see the string.
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In Regular Expression, type the string you expect to see.