Every record in the database must reside on one of the hierarchical database levels. Each level is allocated a unique number (an integer from 0 to 10) and a record's level number is simply the number of the level on which the record occurs.

Level 0 of the database always contains at least one record which cannot be deleted, renamed or moved. In all databases, except for the Main database, there is only one Level 0 record and it is called Top. It represents the entire database. In the Main database, there may up to three level 0 records and they are called Deposit (Pil 1), Stockpiles (Pil 2) and Dumps (Pil 3). The Deposit record will always exist, whereas the other two will only exist when you have created stockpiles or dumps in your project. In the Main database, these level 0 records are referred to as the database sections.

All other database records must occur on one of the ten user defined levels (levels 1 through 10).