# Creo

This page explains how modifications to parts may affect their persistent ID’s in the Creo file format.

The first set of tables contains two cube images. The left image represents the original, unaltered cube model, while the right image shows the modified instance of the cube model, as described in each section title. The second set of tables provides details on any new or modified persistent ID’s for the model, based on the modified instance described in the section. This includes changes or additions related to faces and edges on the model.

Please note that some sections may not have a second table. However, in these particular cases, context is provided after the initial table.

## Adding a loop to a face - Extruding a hole into a cube

In this instance, the part was modified by adding a loop to a face. This is the same as extruding a hole into the cube.

Original Cube Part | Modified Cube Part
--- | ---

| Faces | Edges
--- | --- | ---
New | 1 face (cylindrical) | 2 edges (see modified image above)
Changes | None | None

## Adding a face to the model - A chamfer

More information coming soon

## Splitting a face - Adding a groove

More information coming soon

## Splitting a Cylinder Surface - Adding a hole through a groove

More information coming soon

## ID Uniqueness - Hole repetition

More information coming soon

## Editing a feature

More information coming soon

## Editing a sketch

More information coming soon

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