you will have to subscribe to QBO+, and before the import  – in QBO company settings turn on qty tracking (inventory) or the conversion will not import inventory as inventory

in QBO gear>settings>company settings
sales>products & services
and turn on qty tracking (inventory)
and
in company settings>expenses>bills & expenses turn on the items table and […]

Resolution for 'and items issue: 'When I export my data from desktop to online will I be able to delete the inactive customers?' available: Yes.

The and items issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the and items issue yourself by looking for a resolution described in the article. If it is a complex and items issue or you are unable to solve the issue, you may contact us by clicking here or by using other and items support options.

For more information about resolving issues related to and items in Quickbooks/QBO or to get support for the issue 'When I export my data from desktop to online will I be able to delete the inactive customers?', click the link below: