There is no fixed structure for Salary, for any Organisation. Basic, DA, HRA are the commonly used heads, and there are end number of allowances, which you have choice, to select. E.g. Conveyance, travel, medical, education, festival, newspaper, furnishing, meal, fuel, house maintenance, and so on. Even above stated, DA, HRA are not mandatory to show in break-up.
Considering taxation aspect, to provide maximum benefits to employees, Company selects Heads, and its percentage, wisely. E.g. HRA, Conveyance etc are exempted to certain extent, from tax perview.
Also, one has to take care of BASIC & DA, since many calculations like PF deduction, Bonus payment etc. relates to these items.
Above stated few lines are only primary thoughts. It requires in-depth study to finalise an Organisation’s salary structure.