In BUSY, you can usually tailor the fields that appear when creating a new item or customeror voucher fields by following these steps for Master Configuration and voucher configuration .
Navigate to 'Administration' then 'Configuration' then 'Masters Configuration.'And Administration' then 'Configuration' then 'Voucher Series Configuration
Select 'MasterType' as 'Item.' or Voucher Type like Sales, Purchase etc.
Specify the desired number of optional fields and their respective master types.
Save the changes, and they will be reflected, presenting all saved fields when creating or modifying items.