Yes, in Lawcus, a feature allows you to mark specific activities as unbillable. This feature distinguishes billable and non-billable activities, ensuring accurate invoicing and client billing.

When adding an activity, you can mark it as 'Non-Billable' if you don't intend to bill the client for that particular activity. Additionally, you can choose whether to display this entry on the invoice or not.

You can check the article for more details: Create Non-Billable Time entries, flat fees and expenses.