Add a rule called Transportation:-

Countries may transport some of eir population from one Territory to another. As long as e has Transportation periods remaining, the Country must announce this by adding “(Transportation Type): (quantity of population), (amount of periods left) periods left” to the Territory, under “In Transit”. That Country’s population in the origin Territory must be reduced by that quantity.

The cost for doing this depends on the control status of the target Territory and the amount and race of the population being transported from the origin Territory:

If the target Territory is controlled by the Country, it is called the Basic Transportation type. The population may be moved in any mixture of the following groupings:
1 unit of population may be moved for 1 Grain and 1 Petroleum for average guys or 1 Petroleum for robots.
10 units of population may be moved for 10 Grain and 5 Petroleum and 3 Metal for average guys or 10 Petroleum for robots.
100 units of population may be moved for 100 Grain and 25 Petroleum and 10 Metal for average guys or 100 Petroleum for robots.

If the target Territory is uncontrolled or occupied by the Country, this is called Frontier Transportation, which costs three times the Basic Transportation rate. In addition, if the population being moved is robots, 1 unit in 5 is lost in transit and removed (with any fractional amount lost rounded up to the next integer). The uncontrolled Territory then becomes occupied by that Country.

If the target Territory is occupied by another Country or disputed, this is called Hostile Transportation, which costs ten times the basic Transportation rate. In addition, if the population being moved is robots, 2 units in 5 are lost in transit and removed (with any fractional amount lost rounded up to the next integer). The occupied Territory then becomes disputed by the Countries involved.

If the target Territory is controlled by another Country, it cannot be moved to.

The Territory’s adjacency and the intervening Territories determine how many periods the Transportation takes:

If the target Territory is adjacent to the origin Territory it takes 0 periods. (i.e. the population is immediately moved.)

If the target Territory is not adjacent to the origin Territory it takes a number of periods equal to the number of intervening Territories on a path to the target Territory from the origin Territory. If there are any Territories controlled by another Country on that path, then the Transportation is also considered Stealth Transportation in addition to its other type.

Stealth Transportation can only be done occasionally and can only be done with 10 or fewer population units.