Hi Kajol,

Welcome to QuickBooks Community!

Here's everything you need to know about inventory management in QuickBooks. 

I hope this helps. 

@Kajol 

Afaik, there is no U/M feature in QB Online. Consider using an inventory managment app and integrate it with your QBO. You may start exploring from these options

http://www.primaseller.com/?utm_source=Affiliate&fp_ref=primaseller

https://go.tradegecko.com/register?code=fiat-lux

https://summit.zapapps.io/?ac=GRTspbJd

Hope it helps.