You can create packs, also known as move with or bundle relationships. This video explains the process:
Steps
Create a non stock controlled pack parent item.
Go to the Relationships tab.
Enter Edit mode.
Use the Relationship Type drop down to select Move With.
Save the screen.
Use the Add button to select each component for the pack.
Confirm the quantity required as each component is added.
If you wish to Change the quantity of an item in the pack:
Click on the Qty button.
Enter the new quantity.
Click Continue .
If you don't define a Value Proportion , the system will calculate this for you when the pack is sold based on the values of the individual items. If you wish to define the Value Proportion , this must add up to 100.