Hi Gerald,
In order to sync with a new QBO company, you must start a new Method account. Your Method account will only sync with the company that it was originally connected to.
If you’ve customized screens in Method to use these custom fields, you can copy them to the new account and any fields on the screen will be added to the tables automatically. On your new account, just navigate to Customize > Screens, scroll to the bottom of the page and select Copy / Import Screen… You are given the option to copy from another account.
All of your QBO data will be imported from your QBO company when you make the initial connection. Obviously, this will not include any data from your Method custom fields, as this data did not sync with QBO. You can however, import this data from your spreadsheet updating the records that were imported from QBO on the initial connection.
You’ll need to use the Import / Export tool to perform this. You won’t be able to use the RecordID as your key field, since the record IDs will differ from your old Method account. Instead, you can select either the Name or FullName field as your key field after checking the Update existing records by matching the key fields option.
It takes a bit of effort, but this should accomplish what you are trying to do. Feel free to post back if you need further clarification on anything that I mentioned. I hope this helps.
-Audisho