Can't add source for water to water hp

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Hi I am very new to modelling in Open Studio (I have only been working for a month) I am having trouble connecting 'source_side_inlet_node_name' and 'source_side_outlet_node_name' of my water to water heat pumps to district heating and cooling. There's no option for this and I'm not sure how to do it through EnergyPlus. I've seen that there's not necessarily a direct answer to my question, but even the smallest bit of guidance would be appreciated.