1. CS, ICWA, CFA (US), CMA(UK). These are Long term duration with more than 3 years.
2. CPA, CFP, CIA, CISA etc. are medium term duration depending upon the devotion and your level of knowledge.
3. Further there are many certification programmes like, CIFRS, NCFM, CMA (US) etc. NCFM course is conducted by the Indian Stock Exchanges and concerned with security market.
The combination of CA+CFA is good in case the interest is for Investment banking and Portfolio Management.
The combination of CA+CPA is also a good one in case interest is in Accounting and Auditing field.
The Combination of CA+CS is also good. With this combination you will be able to handle Secretarial deptt along with Account and finance deptt. It is also very helpful to take top chances to work with top management.
Combination of LL.B. with CS
With CS qualification you may join LL.B. to convert yourself into a complete package of lagal person. With CS+LL.B. combo you can also get the chance with top management level. LL.B. is a very good combination with CS because overall approach required for both the courses is same.
With additional LL.B. qualification you can easily and confidently handle Legal work/department along with the secretarial work/department. Later on you may be get promoted to legal and secretarial head.