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Either on the electric side or on the hydraulic side, you are advised to connect all the pumps in parallel.

At the moment PVsyst accepts electrical connections in series only for centrifugal pumps with DC motor. Other configurations don't make sense.  The reasons are:

On the electric side, connecting two positive displacement pumps in series will prevent good starting conditions; after one pump has started, overcoming its peak starting current, the current will suddenly drop to the operating value; therefore the total current will be limited so that the second pump may never reach its own thresholds current.

On the hydraulic side, it is probably not a good practice to connect two pumps in cascade for obtaining a higher head in the same flow, as non-linearities in the pump behaviour, or electric feeding differences, may lead to very unbalanced heads.  This is especially true for positive displacement pumps.

It is far better to choose a pump model which undertakes the nominal foreseen head.