Cloudformation's condition statement (Glue's subnet) - amazon-web-services

Question

I need my Glue job to use specific subnet based on environment it is ran in. Below line SubnetId throws syntax error. I read in aws' doc that true/false evaluation can be addressed with !Ref, issue seems to be with syntax for condition.
SubnetId: !If [!Ref UseProdCondition, !Ref PrivateSubnetAz2, !Ref PrivateSubnetAz3]
GlueJDBCConnection:
Type: AWS::Glue::Connection
UseProdCondition: !Equals [!Ref "${AppEnv}", "production"]
Properties:
CatalogId: !Ref AWS::AccountId
ConnectionInput:
ConnectionType: "JDBC"
ConnectionProperties:
USERNAME: !Ref Username
PASSWORD: !Ref Password
JDBC_CONNECTION_URL: !Ref GlueJDBCStringTarget
sslMode: 'REQUIRED'
PhysicalConnectionRequirements:
AvailabilityZone:
Ref: AvailabilityZone2
SecurityGroupIdList:
- Fn::GetAtt: GlueJobSecurityGroup.GroupId
SubnetId: !If [!Ref UseProdCondition, !Ref PrivateSubnetAz2, !Ref PrivateSubnetAz3]
Name: !Ref JDBCConnectionName

Answer 1

Condition needs to be defined as a separate resource, later referenced in specific resource.
Thanks #MisterSmith!
AWSTemplateFormatVersion: 2010-09-09
Description: AWS Glue Spark Job
Conditions:
UseProdCondition: !Equals [!Ref AppEnv, "production"]
GlueJDBCConnection:
Type: AWS::Glue::Connection
Properties:
CatalogId: !Ref AWS::AccountId
ConnectionInput:
ConnectionType: "JDBC"
ConnectionProperties:
USERNAME: !Ref Username
PASSWORD: !Ref Password
JDBC_CONNECTION_URL: !Ref GlueJDBCStringTarget
sslMode: 'REQUIRED'
PhysicalConnectionRequirements:
AvailabilityZone:
Ref: AvailabilityZone2
SecurityGroupIdList:
- Fn::GetAtt: GlueJobSecurityGroup.GroupId
#SubnetId: !Ref PrivateSubnetAz2
SubnetId: !If [UseProdCondition, !Ref PrivateSubnetAz2, !Ref PrivateSubnetAz3]
Name: !Ref RTMIJDBCConnectionName