How to add labor and small components to an asset

Hello,

We  need help handleling this case, i.e. We create a PO for an electric work, this PO has many lines with all the material we have to use ($4000.00) , I have received the PO, Match the Invoice and send it to FA,since I have to add this to my property improvements (asset), in the new queue I have all those lines, what is the better way to treat this as one asset and avoid treat for example cable as one  single asset????

Thanks

M.