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Hello Zakir,
Thanks for writing to us and being elaborate on your query. Here are the answers to some of your queries:
Q#1: Answer: There is no need to define a negative current in the current source in SIwave. You must define the max current value that can flow through that particular power net as the value of the current source (in Ampere). For the next part of the query, a snap of the power tree would be needed to comment anything specific to your requirement and observations.
Q#2: Answer: The negative terminals of the current source and its corresponding voltage source must be connected to the same net at respective location. In other words, both the voltage and current source for a particular power net must take reference from the safe net in the PCB. The negative net of the voltage source is put to ground as per the workflow. No terminal must remain floating.
Q#3: Answer: If the voltage and current sources are connected exactly the same way in which the wizard does, the manually created sources do reflect in the DCIR configuration wizard as well. This can be seen below:
 
The workflow wizard creates pin groups of the positive and the reference nets and creates the voltage/current source between these pin groups. While doing manually, if the same process is followed, the sources will be reflected in the workflow wizard as well.
Q#4: Answer: To see a combined temperature plot of both ICs and traces, you need to perform an independent Icepak simulation wherein you will define the IC power loss (2.32W) as the heat source and for PCB layers import the .out/.outb powermap files obtained as a power map export after DCIR simulation in SIwave.
I hope the above explanation was helpful.
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