Two Seperate 'worksheetchange' in one Workbook

I am aware that it is impossible to have two VBA Worksheet Changes in one workbook. However, I have 2 macros that I require to operate for my model to work properly. These are as follows:

1, Data Validation Code that allows users to add new entries to Drop Downs (and update the respective table)

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2, VBA that allows multiple selections in drop down menus, then displays them one after another in the cell.

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Is it possible to combine these two pieces of code? I am on a tight deadline with this so any help would be greatly recieved.

Thanks Norie. Could you point me in the right direction with the rest of the code as my VBA knowledge is quite l