---
title: "Add model to calculation group"
slug: "add-model-to-calculation-group"
description: "Define default formulas in calculation groups using models for transaction types. Streamline project management with tailored formulas for efficiency."
tags: ["Task", "Project Control Suite", "PCS"]
updated: 2026-03-20T08:34:51Z
published: 2026-03-20T17:45:57Z
canonical: "docs.staedean.com/add-model-to-calculation-group"
---

> ## 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.

# Add model to calculation group

Use models in a calculation group to define a set of default formulas. You can define several models for each calculation group.

For each model, you can define a default formula for each of the transaction types. You can use a formula in several models.

Only add the required formulas to a model. For example, if only a formula for hours is required, don't define formulas for the other transaction types.

### Steps

1. Go to **Project management and accounting** > **Setup** > **Advanced project management** > **Calculation groups**.
2. Expand the **Models** section.
3. Click **New**.
4. In the list, mark the selected row.
5. In the **Model ID** field, type a value.
6. In the **Name** field, type a value.
7. In the **Hour formula** field, enter or select a value.
8. In the **Expense formula** field, enter or select a value.
9. In the **Item formula** field, enter or select a value.
10. In the **Equipment formula** field, enter or select a value.

> [!NOTE]
> **Notes**
> 
> On a calculation group, you can define several formulas for a transaction type. If you have done so, on a work breakdown structure, you can change the default formula for an:
> 
> - **Activity** - You can do so on the **Work breakdown structure** form, in the **Calculation** section, in the **Formula selection** group.
> - **Estimate line** - You can do so on the **Work breakdown structure** form, in the **Line details** section, on the **Estimated costs and revenue** tab, in the **Formula** field.