Table Compos contains records that are related to ALL Topic Records or just some.
If there is a global field in Compos Table set to "1" and a global field in Topics Table set to "1"
all Topics records will show in Portal using a relationship based on Compos global field andTopics global field.
First link is a youtube video on relationships Uploaded by UKFileMaker
Your Topics table should have a field called fk_ComposID. In your graph connect the tables as:
Compos::ComposID = Topics ::fk_ComposID
... and below select checkbox 'allow creation of related ...' on the Topics side. Place your Topics portal with your fields from Topics in the portal. Do NOT put the Topics fk_ComposID in the portal. Now when you type into fields on the first blank row it will create a new Topics record and automatically insert the ComposID into the Topics records when it creates them.
Thanks for the inputs.