Is it possible to have sub-products within a product, or group products together on the same page?

Hi there, I'm trying to create a 'custom pack' that has 10-15 subproducts within it.

https://highvoltage.squarespace.com/test
Password: HvS

Ideally it would be;

CUSTOM PACK
Choose a combination of 6 or 12+ products below to make you custom pack.                    
                            Quantity    Price
Item 1                 1                  $10
Item 2                1                 $8
Item 3                2                 $12
Item 4                2                 $40
etc etc etc

Pack total         6                 $122

Then in the cart, it is displayed as one item showing the subproducts and their quantities.

SHOPPING CART

Custom Pack
1 x Item 1
1 x Item 2
2 x Item 3
2 x Item 4

If the custom pack product is not achievable, is there a way to add a text line to each product in the cart to identify it as part of the Custom Pack?
For example:

SHOPPING CART

Product Name
Custom Pack

Thanks in advance
Douglas

Sorry wrong link and password.

https://www.silverspoonestate.com.au/product-test
PW: test