for Master/Detail report you need to setup the datasets in master detail configuration, a dataset bound to master table, detail dataset bound to detail dataset. Then link Master Data band to Master Dataset and Detail band to Detail dataset. Then everything should be automatic.
In LazReport/Samples/Editor there is an example of master/detail report, see Master-Detail test button.
But... as it seems you don't have two tables, the ideal report for your data is a "grouped report", drop a group header band and set the group criteria to EMP_NAME field, then drop a master band and put the other fields here, that should do it.
Also in Samples/Editor there is a grouped report sample, to run it, first select Index "BYCOUNTRY" from the index combo box, then open report "albumsbycountry.lrf" located in samples/editor directory, then press preview button. You can edit report to see the design, etc.