Hi @roshanmathews,

I'll share some insight about assembly items. This feature isn't available in QuickBooks Online. However, you can check for a third-party applications that integrates with QuickBooks that'll cater building assembly.

You can visit our website: QuickBooks App Store.

Additionally, here's the link that'll help you manage QuickBooks-related tasks. It has our general QuickBooks topics with articles: Help articles for QuickBooks Online-International.

Please don't hesitate to reply if you have follow-up questions or concerns with inventory items. I'll be around for you. Take care and be safe.