Overseas is used with these nouns:
aid, asset, bank, branch, colony, commitment, competition, competitor, country, customer, distributor, empire, expansion, holiday, import, investment, investor, manufacturer, market, office, possession, post, posting, sale, student, subsidiary, supplier, territory, tour, tourism, trade, travel, trip, visit, visitor, voter

Overseas is used with these verbs:
expand, export, invest, locate, transfer, travel