Final answer:
When someone says to white-line your next project, it means to start with a clean slate and remove any previous work. White-lining allows you to approach the project without constraints or preconceived ideas.
Step-by-step explanation:
When someone says to white-line your next project, it means that they are asking you to start the project with a clean slate. In the context of art, white-lining refers to erasing or covering up any previous work in order to start fresh.
For example, if you are working on a painting and you're not happy with the direction it's going, you can white-line it by painting over the existing layers or by starting over on a new canvas.
By white-lining your next project, you have the opportunity to approach it without any constraints or preconceived ideas.