multiple column in one slicer

Hi abgnfirdaus ,

It is not supported to use column header as slicer and use DAX to get column header.

You could try following methods.

1# Open Query Editor, select these 3 columns and use Unpivot Columns feature.

2# Create a calculated table by using below formula:

Table 2 = UNION(
            SELECTCOLUMNS('Table 1',"equipment",'Table 1'[Equipment],"voltage",'Table 1'[Voltage],"cable","red cable","value",'Table 1'[Red cable]),
            SELECTCOLUMNS('Table 1',"equipment",'Table 1'[Equipment],"voltage",'Table 1'[Voltage],"cable","yellow cable","value",'Table 1'[yellow cable]),
            SELECTCOLUMNS('Table 1',"equipment",'Table 1'[Equipment],"voltage",'Table 1'[Voltage],"cable","blue cable","value",'Table 1'[blue cable])
                )

You will get a new table like below by using above methods.

Then you could create slicer and line chart as below.

Best Regards,

Jay