---
title: "Use calculations in work breakdown structure"
slug: "use-calculations-in-work-breakdown-structure-project-change-order"
tags: ["Flow", "Project Control Suite", "PCS"]
status: "new"
updated: 2026-03-20T13:13:26Z
published: 2026-03-20T17:46:07Z
canonical: "docs.staedean.com/use-calculations-in-work-breakdown-structure-project-change-order"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.staedean.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Use calculations in work breakdown structure

In a project change order work breakdown structure, you can set prices on several levels. For example, project change order, task, or estimate line.

- The total sales value is calculated based on the quantity times the sales price. If the project type is:
- Time and material, the sales prices have a direct consequence for the project invoicing.

Fixed price, the sales prices are shown by the on-account transactions.

In construction projects, quantities are often calculated based on specific settings. In Project Control Suite, this is done with calculation groups.

Calculation groups define:

- The formulas that are used to calculate the estimate line quantities for activities in the work breakdown structure.
- The models with the default formulas for each transaction type.
- The setup that is required for progress billing: a variable that is marked as scheduled unit. For progress billing, usually, the scheduled unit variable is a percentage.
- The setup that is required for subcontracting: a variable that is marked as scheduled unit and for which the unit is defined as well. Reason: subcontracting uses purchase orders and on the purchase lines a unit is required.
- A cost price (expense) or sales price (expense) for a specific scheduled unit.

## Flow diagram

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