e.g.

a   1.1;

// Access to sub-entries using the "/" operator, e.g.
d
{
    b   4.8;
}
e   #calc "$a / $d/b";

src/OpenFOAM/db/dictionary/dictionary.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2023 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2024 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -105,7 +105,7 @@ const Foam::entry* Foam::dictionary::lookupScopedSubEntryPtr
                 const entry* entPtr = lookupScopedSubEntryPtr
                 (
                     firstWord,
-                    false,          // recursive
+                    recursive,
                     patternMatch
                 );
 

test/dictionary/testCalc

@@ -29,6 +29,13 @@ c   #calc "$a / $b";
 
 c   #calc "($a)/$b";
 
+// Access to sub-entries using the "/" operator, e.g.
+d
+{
+    b   4.8;
+}
+e   #calc "$a / $d/b";
+
 s   "field";
 fieldName #calc "$<string>s + \"Name\" ";