There is no fixed structure for salary in any organization. Basic, DA, and HRA are the commonly used components, and there are numerous allowances from which you can choose. For example, conveyance, travel, medical, education, festival, newspaper, furnishing, meal, fuel, house maintenance, and so on. Even the above-mentioned DA and HRA are not mandatory to show in the breakdown.
Considering the taxation aspect, to provide maximum benefits to employees, companies select the heads and their percentages wisely. For example, HRA and conveyance are exempted to a certain extent from the tax purview. Also, one has to take care of BASIC & DA since many calculations like PF deduction, bonus payment, etc., relate to these items.
The above-stated few lines are only primary thoughts. It requires an in-depth study to finalize an organization's salary structure.