Can my office stop me from voting?

All citizens regardless of their race, color and previous condition of subjugation have the right to vote under the Citizenship Act which grants them protection under the 15th Amendment.

As per the Election commission of India, citizens are eligible to become voters under the following conditions:

Every citizen who is 18 years old on the qualifying date (January 1 of the year in case), unless disqualified, is eligible to be enrolled.

Enrollment only at ordinary place of residence.
Enrollment only at one place.
An overseas Indian is deemed to be ordinarily resident at the address given in passport.
A service voter is deemed to be ordinarily resident at the home address.

The general guidelines that most companies follow are that as a voter you may cast your vote by either coming to office late or by leaving early during polling hours considering the work convenience/requirement and by keeping your reporting manager informed. However, this rule varies from company to company.

Although a company is not allowed to stop you from voting, there is no rule given by the Election commission about allowing or not allowing voters to go and vote during the office hours.

You are a service voter if:

You are in the armed forces.
You are from Assam Rifles, CRPF, BSF, ITBF, GREF in Border Roads Organisation and Central Industrial Security Force.
Employed by the Government of India in a post outside India.
Member of an armed police force of a state, and serving outside that state.

How to enroll as a service voter:

Find out the name of your constituency in the district/state of residence
Fill enrollment form
Fill two copies of Form 2 for armed forces 1) Form 2A for armed police force 2) Form 3 for government officials serving abroad.
Fill the declaration form and submit the forms to the record office or nodal officer
A wife of a service voter will be enrolled as a service voter on the basis of the declaration made by her husband in the form.
No separate declaration is required to be made by the wife
Only a wife can be enrolled as service voter, not a son or daughter.
One can also opt to enroll as a general elector at the place of posting if it's a peace posting.