Should Revenue Generating Teams (Sales, Business Development, IT Software Proffs,etc) be entitled to Flexible Working Hours? What about Support teams?

If an employee is working perpetually after office hours then office hours should be flexible for him. Department does matter (supporting or sales, IT or marketing)

some times we need fexible working hours.

I believe that every employee working hours should match the working hours of his/her customer. My working hours are my customers' working hours.

These team are required to be flexible as much as possible to meet the business needs.  Consequently the organisation should be flexible with them as much as possible.  How you can request an employee to report very early to the office while he was working till evening last day?

The support team don't need flexible timing they are expected to be available on the standard working hours for operational need. Yet for not having double standards there can be flexible time yet limited options like to report from8:00 am or09:00 am and to be approved from line manager. 

Flexible working hours is one of the motivating factors for the employees of present day's generation. If the revenue generating teams are having flexible working hours, in that, the support teams should also have the equal / same facility. Because, without the team works or the harmonization of main stream and support stream a perfect completion of any assignment / work is totally IMPOSSIBLE.

Team work, Planning on a participatory basis and Flexible Working Hours for speacial teams in addition to continuous learning and development are creative management tools to enrich working environment of  Engineering Consultations Bodies and ensure success.

yes, the revenue generating teams e.g sales, business development. IT software proffs are suppossed to be working on flexible terms. The support teams dont neccessary need to work on flexible terms becasue they are only back up staffs, they dont actually generate revenue for the company.

there is job description for each other ,werever  everyone must be on his track to achieve the organization's target

YES ofcource the revenue generating teams can be made flexible timings with this the team will not get pressurized and can result in downfall of revenue.

and if we talk about support team there should be also flexible timings in some sinarious otherwise 

it can also be provided as flexible timings according to company requirements

It depends on what the company is providing to the customer, if it's required to work 24 hours, then it should be, if not, then we can organize 2 flexible shifts to the employees.