#combine dict
dict1 = {'BH': ['apple1', 'banana1'], 'FB': ['orange1', 'grapes1']}
dict2 = {'BH': ['apple2', 'banana2'], 'FB': ['orange2', 'grapes2']}
dict3 = {}
for k in dict1.keys():
dict3[k] = ['one/' + itm for itm in dict1[k]] + ['two/' + itm for itm in dict1[k]]
print(dict3)