中國銀行上海分行浦東支行寶山分理處 indicates a hierarchical structure of the Bank of China system. I guess the English translation will be different if you just want to send a letter to the Baoshan office or you are preparing for a document. If for the latter, you may have to use the following tedious title:
The Baoshan Office of the Pudong Subbranch of the Shanghai Branch of Bank of China.
To send a letter, write to: Baoshan Office of Bank of China, ???? Rd, Baoshan district/county/(anything suitable), Shanghai (P. R. of China)