Consider using an inventory management app with the multi-warehouse and B2B portal feature for wholesaler to integrate with your QBO. There are many options in the market and you may start exploring from these ones

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