You will have to put the BD in the notes section of the customer record
then run the customer contact list, customize and add the notes field to the column display
Resolution for 'column display issue: 'How do I enter the client’s Birthday?' available: Yes.
The column display 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 column display issue yourself by looking for a resolution described in the article. If it is a complex column display issue or you are unable to solve the issue, you may contact us by clicking here or by using other column display support options.
For more information about resolving issues related to column display in Quickbooks/QBO or to get support for the issue 'How do I enter the client’s Birthday?', click the link below: