Can you provide us ability to move the custom attachments page in the Attachment section instead of Details section in the FactBox.
For example see the below code snip.

addafter(CustomerDetailsFactBox)
{
//This comes under Attachment section
part("My Attachment"; "Document Attachment Factbox")
{
ApplicationArea = All;
Caption = 'Standard Attachments Custom Name';
SubPageLink = "Table ID" = CONST(18),
"No." = FIELD("No.");
}
//This comes under Attachment section
part("Attached Documents"; "Document Attachment Factbox")
{
ApplicationArea = All;
Caption = 'Standard Attachments';
SubPageLink = "Table ID" = CONST(18),
"No." = FIELD("No.");
}
//This comes under Details section, I want to move this part also in attachment section
part("Project Attached Documents"; "Project Attachment Factbox")
{
ApplicationArea = All;
Caption = 'Project Attachments';
SubPageLink = "Table ID" = CONST(18),
"No." = FIELD("No.");
}
}