Simply enclose all of them within a single code block:
( // open big block
Pbind(
\freq, Pn(Pseries(110, 111, 10)),
\dur, 1/2,
\legato, Pwhite(0.1, 1)
).play;
Pbind(
\freq, Pn(Pseries(220, 222, 10)),
\dur, 1/4,
\legato, Pwhite(0.1, 1)
).play;
Pbind(
\freq, Pn(Pseries(330, 333, 10)),
\dur, 1/6,
\legato, 0.1
).play;
) // close big block
For advanced ways of playing Pbind
s simultaneously and in sequence, check out Ppar
and Pspawner
.