As always, there are many ways to do that. I will outline one way. Please load your dac-file. After that, go to the [b]Data panel[/b] and right-click on [b]Hydraulic head[/b]. From the context menu, choose [b]Export Data[/b] - [b]All Timesteps[/b]. Now, you can decide between [b]All Nodes...[/b], [b]Current Slice[/b], [b]Current Slice Selection [/b] and [b]Current 3D Selection[/b]. I assume you want to export the heads calculated on specifric nodes of interest. In this case you can work with a selection.
After you exported the file, please load the fem-file you are interested in. Finally, you can make a [b]Parameter Link[/b] as usual. Please note that this workflow assumes that both models have the same mesh topology.