Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
branch [brɑːntʃ] n (of tree) ве́тка* ветвь*f (fig, of family, organization) ветвь#; (COMM) (of bank, company etc) филиа́л
vi разветвля́ться (разветви́ться*perf)
branch out vi (fig) разветвля́ться (разветви́ться perf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.