
einteilen
to divide
To divide something into several parts, sections, or groups.
Der Lehrer hat die Klasse in vier Gruppen eingeteilt.
The teacher divided the class into four groups.
to divide / manage / assign
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to divide
To divide something into several parts, sections, or groups.
Der Lehrer hat die Klasse in vier Gruppen eingeteilt.
The teacher divided the class into four groups.

to manage
To use available resources such as time, money, or energy in a planned and economical way.
Wenn du dir deine Zeit gut einteilst, schaffst du alle Aufgaben.
If you manage your time well, you will get all the tasks done.

to assign
To assign a person a specific task, duty, or position.
Der Sergeant hat mich für den Küchendienst eingeteilt.
The sergeant assigned me to kitchen duty.
'Einteilen' (to divide/manage/assign) is a separable verb. The prefix 'ein-' comes at the end in main clauses. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Ich teile mir den Kuchen gerecht ein.
I divide the cake fairly for myself.
The verb consists of the prefix 'ein-' and the verb 'teilen' (to divide/share). Here, the prefix strengthens the idea of organizing something into closed units or groups.
Wir teilen den Text in drei Abschnitte ein.
We divide the text into three sections.
When something is divided into sections, the preposition 'in' is used followed by the accusative. The pattern is: etwas (Akk.) in etwas (Akk.) einteilen (to divide something into something).
Die Organisatorin teilte die Teilnehmer in kleine Gruppen ein.
The organizer divided the participants into small groups.
In the meaning 'to use in a planned way', the verb is reflexive. The person managing something is in the dative (sich), and the resource is in the accusative. The pattern is: sich (Dat.) etwas (Akk.) einteilen (to manage something for oneself).
Du musst dir dein Geld besser einteilen, sonst ist es am Monatsende weg.
You need to manage your money better, otherwise it will be gone by the end of the month.
When a person is assigned to a task, the preposition 'zu' with the dative or 'für' with the accusative often follows. The pattern is: jemanden (Akk.) zu/für etwas einteilen (to assign someone to/for something).
Der Chef hat mich für das neue Projekt eingeteilt.
The boss assigned me to the new project.
to share / divide
Teilen and einteilen can both turn one class into several groups. Teilen generally refers to forming separate groups. Einteilen emphasizes more strongly that people are assigned to groups according to a plan or specific criteria.

Die Lehrerin teilt die Klasse nach Sprachkenntnissen in vier Gruppen ein.
The teacher divides the class into four groups according to their language skills.
Die Lehrerin teilt die Klasse in vier Gruppen.
The teacher divides the class into four groups.