When creating a custom project field, you have the ability to add an auto-increment. This adds a unique auto-generated identifier to each Project. It also allows you to attach a specific, searchable identifier to your project.
Using auto-increment in custom fields
Go to OrganizationSettings > ResponseProjects > Custom Fields and click Add New.
Assign a Merge Tag Name and a Display Name, then select which category the identifier should be assigned to.
Set the Type to Auto Incremental, then click Got It on the Warning pop-up stating that all projects, including past projects, will be assigned an identifier.
Customize your Identifier and choose a starting number. Note: The Initial Value field can have a maximum of 8 digits.
Check the Searchable box to enable the ability to search for the content by its Identifier.