VBA code to allow changes to existing worksheet data

[JackDomino1]

Morning all,
I hop I explain this well enough.

I have a worksheet that monitors peoples favourite snacks, see image.

I have a combobox1 in a userform which displays a list of all names. When the user selects a name, the preferred choice of snacks appear in the listbox on the userform.
Combobox2 has a list of all available snacks.

I need to be able to update the listbox by removing items and adding new ones from Combobox2. Then, once a command button is pressed, the updated values in the listbox are used to update the record in Sheet1.

So for example. CB1 would show "Ben, Charlie and Derek"
If the user selects "Ben", then LB1 would display Chocolate, Sweets and Cereal (I have managed to get this far)
The user can then select "Chocolate" from the LB1 and press a command button which removes it from the LB.
The could also select "Yogurt" from CB2 to add to the LB.

Finally, once all changes are made (the LB should display, Sweets, Cereal and Yogurt). The user can press the "Update" Command button, and this would make the changes in the worksheet.

Thank-you