HI @mingzi.dugu
to the question 1: if SAP allows to select multiple line, you can also do it with UiPath. It really depends on SAP transaction. Please check first, if you can perform multi selection manually. In some case helps to select one line and select the next one with CTRL+click. You need to experiment. Once you know how to do it manually, it would be easy to do it with UiPath
to the question 2:
read the similar thread here: Select right Row in SAP view
or use https://docs.uipath.com/activities/docs/table-cell-scope activity to enter the row number
Best regards, Lev