die Aufteilung
division
The process in which a whole is divided into several parts, portions, or sections.
Die gerechte Aufteilung der Aufgaben im Team ist sehr wichtig.
The fair division of tasks within the team is very important.

division / layout
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division
The process in which a whole is divided into several parts, portions, or sections.
Die gerechte Aufteilung der Aufgaben im Team ist sehr wichtig.
The fair division of tasks within the team is very important.

The noun 'Aufteilung' (division/layout) is derived from the separable verb 'aufteilen' (to divide up). The ending '-ung' turns the verb into a feminine noun that describes the process or result of dividing.
Wir müssen die Aufgaben gerecht aufteilen.
We have to divide up the tasks fairly.
To say what is being divided, you often use the preposition 'von' with the dative. To say among whom something is being divided, you use 'unter' with the dative or 'zwischen' with the dative.
Die Aufteilung von Gewinn und Verlust ist im Vertrag geregelt.
The division of profit and loss is regulated in the contract.
In the sense of 'zerlegen' (to break down/divide), 'Aufteilung' is often used with abstract things such as costs, tasks, profit, or time. A common combination is 'gerechte Aufteilung' (fair division).
Die Aufteilung der Kosten war ein zentraler Punkt der Besprechung.
The division of the costs was a central point of the meeting.
This meaning almost always refers to rooms or areas. Words like 'Wohnung' (apartment), 'Zimmer' (room), 'Haus' (house), or 'Grundriss' (floor plan) in the context clearly point to the spatial layout.
Die Aufteilung des Zimmers in einen Schlaf- und einen Arbeitsbereich ist sehr praktisch.
The division of the room into a sleeping area and a work area is very practical.
structure / assembly
'der Aufbau' and 'die Aufteilung' can both show how something is structured. 'Aufbau' refers more to the overall structure or internal organization of something. 'Aufteilung' emphasizes more strongly that a whole is divided into parts, areas, or portions. That is why people often say 'Aufteilung der Räume' (layout of the rooms), 'Aufteilung der Arbeit' (division of the work), or 'Aufteilung der Kosten' (division of the costs). The words can be confused when talking about the structure of a text, an apartment, or a plan. As a guide: 'Aufbau' tends to ask: How is the whole thing organized? 'Aufteilung' tends to ask: What parts are there, and how are they distributed?

Die Aufteilung der Aufgaben im Team ist heute besonders wichtig.
The division of tasks within the team is especially important today.
Beim Lernen hilft mir der klare Aufbau des Buches.
When studying, the clear structure of the book helps me.