Templates: [{
    TemplateId: Guid,
    TemplateTitle: string,
    SubscriptionsGroups: [{
        Type: GroupType,
        Subscriptions: [Subscription]
    }]
}]


GroupType: Choose | Required | Optional
+ customizations

Subscription: {
    SubscriptionId: Guid,
    SubscriptionTitle: string,
    ServicesGroups: [{
        Type: GroupType,
        Services: [Service]
    }]
}


GroupType: Choose | Required | Optional
+ customizations

Service: {
    ServiceId: Guid,
    ServiceTitle: string,
    ResourcesGroups: [{
        Type: GroupType,
        Resources: [Resource]
    }]
}


GroupType: Choose | Required | Optional
+ customizations

Resource: {
    ResourceId: Guid,
    ResourceTitle: string,
    Price: decimal
}

Resource: {
    ResourceId: Guid,
    ResourceTitle: string,
    Price: decimal
    SubResourceGroups: [{
        Type: GroupType,
        Resources: [Resource]
    }]
}


GroupType: Choose | Required | Optional
+ customizations

// back → front
Templates: [Guid1, Guid2]
TemplatesModels: {
    Guid1: {},
    Guid2: {}
}
SubscriptionsGroups: {
    Guid3: {}
}
Subscriptions: {
    Guid4: {}
},
ServicesGroups: {
    Guid5: {}
},
Services: {
    Guid6: {}
},
ResourcesGroups: {
    Guid7: {}
},
Resources: {
    Guid8: {}
}

// front → back