? for italic
Liguri and Etruscan Italic would be very different from Adriatic Italic in the beginning
Does Celtic take in Gallic or just plain ancient central european Celtic
I think the "?" means that we don't actually know if the italic language might be associated with a Beaker complex.
Some authors do indeed believe that at least the first wave of proto-italic speakers in the peninsula could be traced back to the Polada culture or at least to the Terramare culture, wich presents (at least the Polada culture) somo point of contact with the Bell Beaker phenomenon.
Other authors believe that proto italic speakers descended in Italy with the spread of the Urnfield culture, and specifically with the diffusion of the Protovillanovan culture in all the paeninsula.
The two theories are not necessarily in disagreement, since it could be that the spread of the protovillanovan culture could be linked to a more recent wave of proto-italic, while the Polada and Terramare cultures could be linked to a more ancient italic expansion.
As far as I know, however, both of this theories are just hypothesis.
It should be noted that the protovillanovan culture, however, spread all over the peninsula and was not necessarily linked to regions were italic language was attested in the following eras: even the etruscans, whic - is believed - didn't speak an italic (nor indo european) language, are associated to the protovillanovan culture and expecially with Villanovan culture of the early Iron age.
As far as Ligures are concerned, their affiliation with the italic language is still debated: some believe they spoke, indeed, an italic language, others say they were celtic speakers; a third hypothesis wants them to be some sort of hybrid between the italic and celtic world (maybe a legacy of an ancient italo-celtic koinè?).
I think the same reasoning could be valid for the spread of the celtic languages and culture as well, wich stemmed from the Alps only at the beginning of the Iron age from an Urnfield-like complex (Hallstatt).
So, an association with the beaker phenomenon isn't yet proved nor for italic nor for celtic, I guess. Expecially if there were languages in the Balkans still directly related to the Yamnaya horizon, I guess we shouldn't completely rule out the possibility that even italic and celtic languages could have been Yamnaya related and not mediated by Bell Beakers.