Procedure to take sabbatical

Hi All, is anyone aware about sabbatical policy for leave of around 6 months to 1 year for attending any relevant course (for example course in Data science) ? Is there any place in ultimatix where we can check this ? Whom should we approach for this if we are in RMG? Is it mandatory to take TCS pre-specified course (if incase TCS talent development team has shared or have such list) to go on sabbatical or we can choose any online/offline course?

I know, lot of questions but any information will be helpful