Group units. Click unit and have assign menu item, then when they select assign, have group 0 to 9 or something like that. Then if one unit is moved to a location they all move to that location. I'm not sure how easy this would be to code. I.e. if it's simpler to have all units in the same time then fine. And making some icon change for group moving would be nice. Maybe multi wagon train icon. Or multi Mounted Soldier icon for military only groups. I'm sure this feature is not original game. I.e. not perfect clone. So maybe it could be made optional feature configurable by preferences. If you are trying to keep the main game identical to the original fine, but it wouldn't hurt to have a extensions menu with selectable new better features after install.
time=tile in or on the same tile.