How to view goods, take samples of goods before making customs declaration?

In case of imported goods, how do enterprises want to change the purpose of use?

In which case, is the customs declarant supplemented?

How is customs clearance done outside working hours, holidays, and holidays?

How are places to register customs declarations?

How is the deadline for filing and submitting declarations?

Please indicate in which case the enterprise can cancel the declaration?

In case the declaration has many contracts or orders, how is the declaration made?

In which case does the customs declarant be allowed to carry out customs procedures for export and import goods registered once?

How are customs clearance locations?

In which case the customs declarant declared on the paper customs declaration?