Go to Object Configuration > Settings and check the fields for each asset. These should be normally sufficient to capture information relevant to your digital twin.
If you want to add additional fields, go to Object Configuration > Fields.
Add new fields only if required. See Adding new custom fields.
After adding the field, you can now assign the new field to the relevant asset including type, component, system, document, room/segment, floor, zone, building, task, inspection, site. See Adding custom fields to components.
Once all the fields are configured, check and configure the field mapping to ensure the mapping of BIM fields to that of Lifecycle Twin . See Mapping fields.