QB Issue Resolution:

create credit card type accounts in the companies, do NOT link them for online downloads, enter transactions manually

as soon as you can you should dedicate one CC per company

Resolution for Issue 'I use a personal credit card for personal and two different companies. How do i separate the transactions to my the associated quick books.Thanks' available: Yes (Solved).
Source: Intuit Community forum.

I use a personal credit card for personal and two different companies. How do i separate the transactions to my the associated quick books.Thanks: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Quickbooks/QBO
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for Quickbooks/QBO [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.

Get 50% off Quickbooks Online

Click Here for 50% off!

Additional Support Options: