UK has categorized the Business Visitor Visa as Standard Visitor Visa where you have to prove your purpose of visits and intentions. Also no matter who is sponsoring you the key factor for visa approval is for your reason to return to your home country.
Then why I have to fill in the below fields.
Do you have savings, properties or other income, for example from
stocks and shares? How much do you spend each month on living costs?
How much of your total monthly income is given to your family members
and other dependants?
You need to demonstrate your financial standings within your country, even if your employer is sponsoring your Business Visit. Please make sure you give 100% transparency in your visa application
And how to fill in the below fields?
The total amount of money you have for this trip? Is someone other
than you paying for all or a part of your trip? can I choose yes and
select 'others' in the relationship field and mention Employer?
You need to provide an estimated cost of your tour which actually demonstrates how well you have planned your visit, this includes your all costs while staying in the United Kingdom.
You can select other and mention the sponsorship from your employer and you need to provide reasonable supporting documents like NOC from Employer, Letter of Consent from the Employer and supportive documents from your employer.
It is your responsibility to satisfy Entry Clearance Officer and they do not assume anything and only make their decision based on the provided document.
Best of Luck for your upcoming visit!