Selected SDTM Domains Use this option to specify the SDTM domains to be added to the study. This option is used when there are multiple SDTM domain files in the same folder. If you leave this option blank, all SDTM domains in the folder are added to the study. To Specify the SDTM Domains: Specify the SDTM folder. Click to open the Add shown below: All of the domains in the specified SDTM folder are listed. Select the desired domain. To select more than one domain, press and hold the Ctrl key while making your selections. Click OK. The specified domain(s) are listed in the field. Click to remove the selected SDTM domain.