add time click button with comma

Hi! I have three Table. Person , Fruit and Mixedtable.

Person

 Fruit

In result I want add fruit and persoid by comma in cell. When I chose apple and click then add in mixedtable personid with fruit.

For example: I click twice button add two personid and two fruit in one rows.

Every time I chose fruit but click button. How I can solve this?