to doing 的语法?

to doing 的语法?简直太奇怪了!今天看见的句子.With a view to gaining greater corporate standing or a bigger pay rise,.......还有一句:The key to relaxation for busy executives is to avoid the types of activities that are part and parcel of their daily work and to devote themselves totally to havig recreational pursuits for at least a part of each day,even it is only for an hour.你们看,to having,在最后面那里。