Let's create a dynamically expandable table which grows as you add more data to it.

Let's watch this:

Ingredients

Apps	Scaffolding
Platform	Server, Data Center
Macros	List Data, List Option, Table Data, Text Data
Suppliers

Guide

Create a dynamic table:

Start by inserting a Table Data macro onto your page.
For the macro name, let's use "Employees".

Note: This is the Table Data macro which is part of Scaffolding. It is not the same as the standard table in Confluence.
Within that Table Data macro, create a table like the one in the following image:
Now, fill in the table cells with Text Data, Adding a dropdown list of users and List Option macros, like in the following image:

Remember to give each macro an appropriately unique name.

For each of the List Option macros, make sure to give a proper label, as the labels are what appears as menu options on the pull-down menu generated by the Adding a dropdown list of users macro.
You can now click on Edit Contents to add data into the dynamic form.
Click the + button to create more rows in the table.

There can only be one row containing Scaffolding macros right below the header row.
You can use Reporting for Confluence macros to extract data from a table and use that data on another page
Remember to use unique Names to avoid conflicts