You don’t have to send one reference on each product separately. Send just one which will contain all of the chosen products. It doesn’t matter if they are in different categories.
• First choose products
Find out the items codes on which you want to send a reference. The item's code can
be found in prouct's detail as well as in thumbnail preview.

• Complete the reference with the items codes
Now just complete the reference using the item's codes. Write www.alza.cz/kod/ and then the chosen item's codes separated by semicolon (;):

The final reference is finished and can be sent to anyone.