A method and a device in a node for wireless communications are disclosed in the present disclosure. A first node receives a first information block set, receives a first signaling and a first signal, and transmits a first bit block in a first radio resource block. The first information block set is used to activate a first information element and a second information element out of N information elements; when the first radio resource block only comprises one resource sub-block, only one of the first information element and the second information element is used to determine a spatial relation of the first radio resource block; when the first radio resource block comprises K resource sub-blocks, K being a positive integer greater than 1, the first information element is used to determine a spatial relation of at least one resource sub-block in the first radio resource block.