You can cast from a Crucible to more than one mold at a time using Channels and Mold Tables. Simply connect the Mold Tables to the Crucible using Channels and right-click on the Channel next to the Crucible. Shift-right-click the Mold Table with a Mold to place it or remove it.
Recipe: tfc:knapping/ceramic/unfired_channel_4
Knapping several Unfired Channels.
Recipe: tfc:knapping/ceramic/unfired_mold_table
Knapping an Unfired Mold Table.
Recipe: tfc:heating/channel
After the channels and mold table are knapped, they will need to be fired, like any piece of pottery.
Multiblock: tfc:channel_casting