add one unit to Baktria

[abou]

I have Pezhetairoi in Baktria but Seleukids is able to recruit Klerouchikoi Phalangitai in almost every they control in not a vary fare fight.

Right, that is how it works.

will the Klerouchikoi Phalangitai be avialable to the eporites and macedonia in the east only, or also in italy

In the east only. They would be taking over military settlements previously established by the Seleukids and Ptolemies, but as such they would have the resources to maintain only the largest settlements.