How can non-EU companies support their OR to prepare for registrations?

The only representative is responsible for submitting a registration dossier or a pre-registration to take advantage from the extended registration deadlines for phase-in substances. In order to assist the OR under REACH, the "non-EU manufacturer" may wish to make himself aware of the information requirements laid down in REACH and start to collect the relevant information. This may include correct identification (CAS or EINECS/ELINCS/NLP) number and naming of the substance and information on its composition.
The "non-EU manufacturer" may also assist in providing all available information regarding the intrinsic properties of the substances (see Annex VII to XI of REACH). However, these supporting measures of the "non-EU manufacturer" cannot relieve the only representative or the importer from the duty to comply with all relevant obligations of the REACH Regulation.