With the help of categories, you divide your model train collection into different types (gauge, era...). You can use up to five levels. The idea behind this technique is a tree, whose trunk is on the left side. Accordingly, the branches branch out to the right side. When you create a new database, an example will be created for you. This can be changed for your collection in an easy way. The following image shows this:

Within the program this looks like:

Depending upon your existing collection, parts can be removed, added or renamed. Each of the five lists represents thereby one level. The number of levels for a type of model may differ from another. In the initial data, wagon and cars have for example four levels, because the level for the engine type is obsolete. Locomotives on the other side have all five levels. You can change this in any way.

For renaming, you click on the appropriate text. Then one can change it, like every other text field. If an entry already exists, all concerned trains are updated automatically. If you like to remove an entry, you must mark the appropriate field and press the "-"-Button underneath the appropriate list. The entry and possible existing levels below (right of the current list) are deleted. For adding an entry, you must use the Button "+" underneath the appropriate list. The new entry gets automatic the name "New". It can be renamed, as described above. If an entry was marked, before you press the Button "+", all elements under the marked one are copied to the new one.

If an entry was marked, before you press the Button "+", all elements under the marked one are copied to the new one.

Every level can get a freely defined name. It is shown, for example, in the lists. By default, the names "Category 1" to "category 5" are entered. With the input fields, above the respective list, you can enter another name.

The usage of the categories gives you a maximum of flexibility for managing your collection.