In NetSuite, we can delete mass records by using inline editing features.
To enable the Inline Editing feature,
Go to Setup > Company > Enable Features > Company tab > Data Management > Inline Editing
Similar to manual deletion, this process is irreversible. Take extra caution when deleting records.
Note: Not all record types support Inline Editing.
For the records that will be deleted, create a Saved Search.
After setting all necessary filters click Save & Run and in the Results tab turn on the Inline Editing option.
Click any editable column denoted by a pencil icon from the first record in the list, shown below:
Hold the Shift key then mouse-click the last line within the column to delete the entire batch. The selected column will display a dotted border when selected
Hold the Ctrl key then mouse-click on specific lines within the column to only delete specific records from the list
Once all target records are selected press Delete.
Click OK from the pop-up warning to continue.