In re Bentley (1974) 43 Cal.App.3d 988, involved a defendant in custody on a robbery charge and a parole hold arising out of the robbery charge. The court reasoned that because section 2900.5, subdivision (b) does not say that credit shall be given only when the custody to be credited is attributable exclusively to proceedings related to the same conduct for which the defendant is convicted, credit is to be given for preconviction custody upon a sentence where the defendant is in custody for several reasons, one of which is his preconviction custody for the course of conduct which led to his conviction and sentence.