This paper studies how firms manage customer portfolios in global markets and what are the implications for export growth. Firms selling abroad need to find trading partners, negotiate bilateral prices and deal with their customers over time. However, most exporters trade with a small number of buyers and these relationships are short-lived, suggesting large costs associated with these tasks. We begin by exploring export relationships using novel data on the transactions between Bangladesh exporters and Chilean importers from 2010 to 2019. Our preliminary analysis reveals two regularities. First, the adjustment of customer portfolios, either by expanding the number of customers or by replacing them, plays a significant role in export growth. Second, exporters continuously renegotiate prices with their customers, increasing both the average and the dispersion of prices as exports increase. These patterns highlight the role of adjusting customer portfolios and negotiating prices for exporting.