You can assign equipment to multiple projects and mark its current project to see where the equipment is onsite when viewing the company's Equipment register.
To see all projects equipment is assigned to, see View Equipment Project Assignments.
If equipment is checked in for a project from the field, the current project is automatically updated. See Check In Project Equipment (iOS) or Check in Project Equipment (Android).
Set a Single Record
Bulk Set Equipment
Navigate to the company's Equipment tool.
Inline, click the field in 'Onsite' column and select the project.
Mark the checkboxes for the relevant equipment.
Click Onsite and select Yes or No.
Navigate to the company's Equipment tool.
Mark the checkboxes for the equipment you want to assign.
Click Add to Projects.
Select the projects.
Optional: For each project, move the toggle 
ON if the equipment has arrived onsite.
Click Add.