> For the complete documentation index, see [llms.txt](https://docs.mashmatrix.com/mashmatrix-sheet/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mashmatrix.com/mashmatrix-sheet/functions_advanced/time_series_matrix_transformation/overview.md).

# Overview

The records applied time-series matrix transformation is represented as nested columns in the sheet as shown below.

![](/files/MNJdv7BsB6olRhOVWj60)

* **\[A] Matrix Column Header** - Header of the combined column that will be the root for the matrix-transformed data. Settings for the matrix column can be changed from the menu in this header.
* **\[B] Series Value Column Header** - Column header that displays fields of the related list record which has sepcific time-series value. It is displayed repeatedly for the number of period specified in the matrix column settings.
* **\[C] Child Column Header** - Column header nested inside of the matrix column, which displays a field value of the related list record . It is repeated as many times as the number of time series values.

{% hint style="info" %}
If only one child column is selected in the matrix column, the child column header is omitted and the matrix column will be two-level nested header structure with only matrix column header and series value column header.
{% endhint %}