I need to make changes to only a few vouchers. Is there a way to do targeted imports/exports?

To make changes to only a few vouchers, there is a way to do a scheduled import/export by using the bulk update option and data export import.
For the bulk update option, you need to follow the below steps:
Go to Administration, then select Bulk Updations, then select Bulk Voucher Creation/Modification, then select your voucher type, then configure the format, and add your format to your voucher.
and load the default component and save the setting. After this, click on modify existing vouchers, load the relevant information, and click on the update option. After loading the details, you can change only a few vouchers that you want to change.
For data export and import, you need to follow the below steps:
Step 1: Go to the Administration section, then click on Data Export Import.
Step 2: Choose the Import Vouchers from Excel option and select the type of voucher that you want to import, such as sale, purchase, etc.
Step 3: After selecting the voucher type, click on the configure button.
Step 4: Create a format for the voucher. Then, map the fields in BUSY to the columns in Excel. You can select the fields from the drop-down list and match them with the Excel columns.
Step 5: After mapping all the columns, select the Excel File Path and enter the starting and ending rows and sheet numbers of your Excel file.
Step 6: Then, click on the Import button and wait for the import process to complete; then, you can change only a few vouchers.