Yes, you can enable Bulk Discount Now app in an unpublished theme. Enabling apps on unpublished themes might seem like a convenient way to test functionality and design during website development. However, we don't recommend this approach because the script might not 100% work on unpublished themes.
To enable the app on an unpublished theme please follow the steps below.
1. In the Shopify Admin go to Sales Channel -> Online Store -> Themes.
2. Click the "Customize" button of the unpublished theme to test.
3. Click the "App Embeds" section.
4. Toggle Bulk Discount Now embed to enable.
5. Click the Save button.