customize to know item remaining available
Thank you for posting on our feedback forum.
In Zoho Invoice, you would not be able to track inventory for your items. However, you can integrate it with Zoho Inventory and know the available stock for all your items.
From your Zoho Invoice account, you can click on Settings > Integrations > Zoho Apps > Zoho Inventory and link these apps.
If you have any further questions, feel free to reach out to support[at]zohoinvoice[dot]com