• I need more rows than the 200 planned rows, can I extend the number of planning rows?
Yes!  Chart gantt can be extended to thousands of rows of planning.  Ensure that you don't just copy down beyond the 200th row.  You need to insert rows prior to the 200th rather than copying down.  The reason for this is that most templates use a Vlookup.  This Vlookup has been set to 200 rows to prevent performance issues on slower computers.  Merely copying down past the 200th row will not update the Vlookup formula, whereas inserting will.