For this you'll need to add subqueries to your report's SQL query which searches for assets in groups. Asset groups are stored in
tblAssetgroups and the membership of assets in groups is stored in
tblAssetGroupLink.
Here is an example report:
Select Top 1000000 tblAssets.AssetID,
tblAssets.AssetName,
tsysAssetTypes.AssetTypename,
tsysAssetTypes.AssetTypeIcon10 As icon,
tblAssets.IPAddress,
tblAssets.Lastseen,
tblAssets.Lasttried
From tblAssets
Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Inner Join tsysAssetTypes On tsysAssetTypes.AssetType = tblAssets.Assettype
Where
tblAssets.AssetID In (Select tblAssetGroupLink.AssetID
From tblAssetGroupLink Inner Join tblAssetGroups
On tblAssetGroupLink.AssetGroupID = tblAssetGroups.AssetGroupID
Where tblAssetGroups.AssetGroup Like 'GROUP1')
And
tblAssets.AssetID Not In (Select tblAssetGroupLink.AssetID
From tblAssetGroupLink Inner Join tblAssetGroups
On tblAssetGroupLink.AssetGroupID = tblAssetGroups.AssetGroupID
Where tblAssetGroups.AssetGroup Like 'GROUP2')
And tblAssetCustom.State = 1