Storing real-time subscription data

Hi, I am using realtime function to retrieve realtime data from Bloomberg. however, I would like to process this data (specifically, calculate the price of basket of securities). For that, I need to pull in about 5-10 tickers real-time prices and store them in variables and do the math.

However, using real-time function, I am unable to actually store the values and do the math. Can you please suggest how do I accomplish this?

I have had some success, thanks to MATLAB Central, writing a simple callback function, but I was unable to store more than one ticker data using that function. ( I can share the detail for call back approach, if needed).

Thank you very much. Kaushal