I need help to design a campaign

[Roman]

The idea is to make a small campaign (2 battles) where special Argentine units carry out an attack on a drug trafficking camp on the triple border of Brazil, Argentina and Paraguay.
The first battle would be in charge of the scouts and snipers with thermal sights, to take advantage of a night attack. They would take the guard posts.
In a second battle the bulk of the troop intervenes.

I have created a couple of scenarios that work well. In the first one I have an exploration force and then reinforcements arrive in turn 10, 2 before finishing the stage.
But when I want to incorporate these scenarios into a campaign, all troops appear in the deployment, the reinforcements command is deactivated.

As I do not handle English well, it may have escaped something.

I don't make a plan b. A scenario with only the troops fighting in the first scenario that would be recognizable, then I add more troops in the other scenarios.
But would it be a problem because the troops you add would be auxiliaries?