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@Hamed Sobhani, there are a few ways you can approach what you are trying to do.

1. You can model the zone as a single space (assigned to one zone). Inside of this you can create an interior partition group (similar to shading group) and then draw one or more interior partition surfaces. These surfaces should generally be drawn where they exist and not go outside of the space they are in. When running a daylighting analysis with Radiance, these partitions impact the daylighting analysis. When running EnegyPlus, these are converted to internal mass objects,described here. OpenStudio does also allow you to directly make internal mass objects, under the internal load tab, and bypass making interior partitions.
2. You can model each of the rooms as their own space in OpenStudio and then assign them all to a single zone. You don't have to worry about making interior partition objets or internal mass objects in OpenStudio. You do however have to run surface matching so OpenStudio can identify inter-space surfaces. When multiple spaces are in the same zone, inter-space surfaces that are in the middle of the zone will be translated to EnergyPlus as internal mass objects.

@Hamed Sobhani, <anonymous user="">, there are a few ways you can approach what you are trying to do.

1. You can model the zone as a single space (assigned to one zone). Inside of this you can create an interior partition group (similar to shading group) and then draw one or more interior partition surfaces. These surfaces should generally be drawn where they exist and not go outside of the space they are in. When running a daylighting analysis with Radiance, these partitions impact the daylighting analysis. When running EnegyPlus, these are converted to internal mass objects,described here. OpenStudio does also allow you to directly make internal mass objects, under the internal load tab, and bypass making interior partitions.
2. You can model each of the rooms as their own space in OpenStudio and then assign them all to a single zone. You don't have to worry about making interior partition objets or internal mass objects in OpenStudio. You do however have to run surface matching so OpenStudio can identify inter-space surfaces. When multiple spaces are in the same zone, inter-space surfaces that are in the middle of the zone will be translated to EnergyPlus as internal mass objects.

<anonymous user="">, Anonymous, there are a few ways you can approach what you are trying to do.

1. You can model the zone as a single space (assigned to one zone). Inside of this you can create an interior partition group (similar to shading group) and then draw one or more interior partition surfaces. These surfaces should generally be drawn where they exist and not go outside of the space they are in. When running a daylighting analysis with Radiance, these partitions impact the daylighting analysis. When running EnegyPlus, these are converted to internal mass objects,described here. OpenStudio does also allow you to directly make internal mass objects, under the internal load tab, and bypass making interior partitions.
2. You can model each of the rooms as their own space in OpenStudio and then assign them all to a single zone. You don't have to worry about making interior partition objets or internal mass objects in OpenStudio. You do however have to run surface matching so OpenStudio can identify inter-space surfaces. When multiple spaces are in the same zone, inter-space surfaces that are in the middle of the zone will be translated to EnergyPlus as internal mass objects.