“We need to retain all the vendors, customers, items, invoices, etc. Is that possible?”

Yes, except for the Invoices.

From the old file: File menu > Utilities, Export Lists.

From the new file: File menu > Utilities, Import Lists.

The Transactions cannot be exported and imported. There are third-party Transaction Copier type tools, but […]

Resolution for 'all items issue: 'How to create a new company file from an existing one (new owner)…without losing all the vendors, customers, all items, etc.,and date it’s start date as Jan. 1st, 2018?' available: Yes.

The all 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 all items issue yourself by looking for a resolution described in the article. If it is a complex all items issue or you are unable to solve the issue, you may contact us by clicking here or by using other all items support options.

For more information about resolving issues related to all items in Quickbooks/QBO or to get support for the issue 'How to create a new company file from an existing one (new owner)…without losing all the vendors, customers, all items, etc.,and date it’s start date as Jan. 1st, 2018?', click the link below: