Mobile:
Click More in bottom right corner
Go to Parts Inventory tab
Select Part to add Asset(s)
Click 3 dots (⋮) next to Restock in top right corner
Select Edit
Click Assign in Assets field
Select Asset(s) to add
Click Done in top right corner
Click Update in top right corner
Web:
Go to Parts Inventory tab
Select Part to add Asset(s)
Click 3 dots (⋮) next to Restock in top right corner
Select Edit
Select Asset(s) to add
Click Update in bottom right corner