Well, you need to organize the data in your spreadsheet in a different way.
Create one row for each entity. Have one column with unique IDs. (In your case that would probable be the column with entries "Q_DATEDTIMETABLE", "Q_DTBASEDATAOWNER", "Q_DTBASEDATAPARAMETERS", and "Q_DTTIMETABLEPERIODOWNER".) Add one column for each attribute of your entities. Insert one additional row before all those rows for entities. In this "first" row, enter the name of each attribute in the corresponding column. (This is not strictly necessary, but simplifies working with your data later on.) Use this set of rows as "Data Range" for the "Node List" section of the Excel Import. Specify the column with the unique IDs as the "Column of Node IDs".
Create a second set of rows consiting of only two columns. For each edge (i.e. connection) you want to have in your diagram, create one row. In the first column enter the ID of the source node, in the second column the ID of the target node. Each ID used here has to match one of the IDs used in the first column of the first set of rows. Use this second set of rows as "Data Range" for the "Edge List" section of the Excel Import. Specify its first column as the "Column of Source IDs" and its second columns as the "Column of Target IDs".
Run the import and verify that the structure is correct and all attributes are available as custom properties.
Then create appropriate visual representations for your nodes. E.g. use an entity node, remove its default attributes label and add one new label for each attribute you imported from Excel. Create a user-defined palette section and add your customized entity node to said section. Next, create a properties mapper configuration that assign the custom properties holding your attribute values to the appropriate label.
Re-run the Excel Import with the same settings as before but additionally set your custom entity node as "Template" in section "Nodes" on tab "Presentation" of the Excel Import. After the import, run your properties mapper configuration to fill the labels of your nodes with the appropriate data.