I am creating tank tables using ullages with the stop command :
     tc (sw*.*) ull: 0 0.5 ... 30 /stop:empty /fsm / vol /we /fsm /noload
Is there a way to give the exact ullage when the tank is at zero volume.  I
noitced that the stop command just gives the next full increment (in this
case, multipes of 0.5m) to correspond to zero volume.


You could do it on an individual tank basis (where you issue a separate
TC command for each tank) by making use of the HEIGHT variable and the
TOP/BOTTOM feature of the REFPT command to calculate the maximum ullage,
setting the value to a user variable which you could then place into the TC

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