Power BI Service missing in desktop version

I think that you are thinking too much in Tableau and not enough in Power BI. Measures are context aware. So, if you create a measure like:

Total = SUM([Sales])

And you want a level of detail of year. Just place this measure into a visual along with Year. If you want a level of detail of customer, just place the measure into a visual along with Customer. There is no need to create LOD expressions for each individual dimension that you want your level of detail at because measures do this automagically via context.