The president can not dismiss any elected officials. The only people that he can dismiss are those that he appoints directly, such as his cabinet and ambassadors.
They serve at the pleasure of the President. He can dismiss them at any time. Cabinet members do not have term limits
A US president cannot hold two government positions at the same time, nor can any other federal government official. Only one former US President has gone on to serve on the Supreme Court: William Howard Taft was Chief Justice from 1921-1930.
The Vice President
Yes, but if the Vice president cannot attend, the president pro tempore takes over.
impeachment
No
no
Yes, Congress has the power to dismiss the President, although this has never actually happened (it came very close in the case of Richard Nixon, but Nixon resigned instead, making it unnecessary to dismiss him).
Yes
president of india
A president can not dismiss an office holder with security of tenure. The office holder with security of tenure can only be removed in exceptional and specified circumstances.
Federal court and appeals judge
Yes, since the President most likely appointed the Press Secretary.
YOU cannot dismiss your own case. A dismissal can only be granted by a judge. You must pay your attorney for any work that he does on your case.
nominate and dismiss officials in the presidential cabinet
The preposition "from" typically follows the verb "dismiss." For example, "She was dismissed from her job."
It's not exactly clear what Executive Directors you may be referring to, or what agencies. The President DOES have the power to appoint and dismiss the Attorney General of the US though.