I would like to create an indicator or chart which gives me total sum of two indexes on one screen. For example instead of putting 2 split charts have one like TICK+TICKQ. Any clue how to do this?

Use the Add method to create dataseries for TICK and TICKQ in your indicator. Declare two doubles, L1 and L2.

OnBarUpdate, when BarsInProgress=1 then L1, the latest value of TICK will be Closes[1][0] and when BarsInProgress=2, then L2, the latest value of TICKQ will be Closes[2][0].

So whenever there is an OnBarUpdate event with BarsInProgress other than zero, set the value of your output dataseries to L1+L2.

For additional information look up BarsInProgress in Ninjatrader Help.