No, the field will be visible only in selected document types. If we have set it as the default for invoices only, and if we convert it to any other document, the field will not be reflected.
If you want to reflect that custom field to other documents as well, please follow the below mentioned steps:
Step 1: Click on the Sales >> Select Document Settings.
Step 2: Click on Add Custom Fields.
Step 3: Select Items >> Click Edit for the custom field you want to reflect in other documents as well.
Step 4. Select “All,” it will be visible for all document types.**
Step 5. You can also select multiple document types.**
