Is it possible to reuse pre-built Text in CloudFormation? - aws-cloudformation

Question

I have a few parameters passed to one of my CloudFormation conf file like this (YAML):
AWSTemplateFormatVersion: '2010-09-09'
Description: AWS CloudFormation Template for creating pipeline workflow.
Parameters:
Opt1:
Description: my opt1
Type: String
Default: opt1_default
Opt2:
Description: my opt2
Type: String
Default: opt2_default
Opt3:
Description: my opt3
Type: String
Default: opt3_default
...
In many other parts of my conf I keep on use:
...
Name: !Sub '${Opt1}-${Opt2}-${Opt3}'
...
Name: !Sub '${Opt1}-${Opt2}-${Opt3}'
...
Name: !Sub '${Opt1}-${Opt2}-${Opt3}'
...
Is it possible to create some reference like:
SomeRef: !Sub '${Opt1}-${Opt2}-${Opt3}'
in a way that I can do:
...
Name: !Ref SomeRef
...
Name: !Ref SomeRef
...
Name: !Ref SomeRef
...
?

Answer 1

Nested template with no resources and single output can do it:
NameCreator.yaml
---
AWSTemplateFormatVersion: 2010-09-09
Description: 'Empty nested template'
Parameters:
Opt1:
Type: String
Opt2:
Type: String
Conditions:
Never: !Equals [ a, b ]
Resources:
NullResource:
Type: Custom::Null
Condition: Never
Outputs:
Name:
Value: !Sub '${Opt1}-${Opt2}'
And then in main template call it:
NameCreator:
Type: AWS::CloudFormation::Stack
Properties:
Parameters:
Opt1: !Ref Opt1
Opt2: !Ref Opt2
TemplateURL: https://mybucket.s3.amazonaws.com/NameCreator.yaml
and use it:
Name: !GetAtt 'NameCreator.Outputs.Name'