Is it necessary for all company partners to be present for the exit of one partner?

No, a specific POA can entitle the attorney to exit the partner, sign the shareholders' resolution and complete the exit or liquidation.

Please call back if you need more assistance.

The partner outside the country has to make a POA in favor of a person whom he/she trust.

Then, the process of cancellation can be carried out.

This is not required, but it is sufficient to give someone else a power of attorney to take the necessary procedures on his behalf.