Hi there, @MKrey.

Thanks for taking the time to reach out here in the Community. I'm here to provide some info about the billable option in your QuickBooks Time account.

While there are many options regarding customization, there isn't yet one to set one item (Yes or No) as default with an option to change to the other one in QuickBooks Time. However, I think this would be a beneficial setting to have available. I encourage you sending a feature request to our Product Development Team to have this added in a future update. This can be done directly in your QB Time account.

Here's how:

1. Click the Help (?) button in the top right corner.
2. Select Suggest idea.
3. Enter your request and choose Send idea.

In the meantime, you'll want to assign the Yes or No item only to the Billable field for a particular customer or project. Here's how:

1. In QuickBooks Time, go to the Customers or Projects menu
2. Click on the particular customer.
3. Select the Custom Fields tab.
4. Under the Items column, click the blue item link next to Billable. This will open the Billable Displayed Items window.
   
    
5. Under Unassigned Items, select Yes or No and click the right arrow to include it in the Assigned Items box.
6. Click Save and then Save again.

Additionally, you'll want to check out this article that includes more info about using custom fields: Set Up and Manage Custom Fields.

Please don't hesitate to reach back out here if you have any other questions or concerns. The Community is always here to help. Take care always, @MKrey.