Regarding question 3.

You can create a custom meter which is a summation of ideal loads in zones.

Here is an example of a custom meter using electricity consumption in various zones:

Meter:Custom,
SuiteElectricity,         !- Name
Electricity,             !- Fuel Type
,       !- Key Name 1
Electricity:Zone:Thermal Zone 1,  !- Output Variable or Meter Name 1
,       !- Key Name 2
Electricity:Zone:Thermal Zone 2,  !- Output Variable or Meter Name 2
,       !- Key Name 3
Electricity:Zone:Thermal Zone 3;  !- Output Variable or Meter Name 3

Just change the output variable name to the appropriate ideal loads name.

As you can probably tell, I use this feature to separate out suite electricity from common areas area electricity in multi-res buildings.

Check the E+ InputOutput manual for other examples

Regarding Regard question 3.

You can create a custom meter which is a summation of ideal loads in zones.

Here is an example of a custom meter using electricity consumption in various zones:

Meter:Custom,
SuiteElectricity,         !- Name
Electricity,             !- Fuel Type
,       !- Key Name 1
Electricity:Zone:Thermal Zone 1,  !- Output Variable or Meter Name 1
,       !- Key Name 2
Electricity:Zone:Thermal Zone 2,  !- Output Variable or Meter Name 2
,       !- Key Name 3
Electricity:Zone:Thermal Zone 3;  !- Output Variable or Meter Name 3

Just change the output variable name to the appropriate ideal loads name.

As you can probably tell, I use this feature to separate out suite electricity from common area electricity in multi-res buildings.

Check the E+ InputOutput manual for other examples