Glossary entry (derived from question below)
English term or phrase:
are built on to
Spanish translation:
se van agregando a la Plataforma conforme con lo que se requiera
English term
Belize
Works in: English to Spanish, Spanish to English
are built on to
Our programme-level Platform (core of operations, the one element that must be in-house rather than outsourced). Sector-specific interventions are built on to Platform as and when they are needed and funding (grants/foundations/ corporates) is acquired.
Consulta adicional, el "as" después de "Platform" como que si no tiene mucho sentido, verdad?
Non-PRO (1): Rosmu
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Proposed translations
Mexico
Translating full-time since 1998
Native in: English (Variant: British) 
Works in: Spanish to English
se van agregando a la Plataforma conforme con lo que se requiera
Spain
Margarita Ezquerra (Smart Translators, S.L.)
Accredited translators 20 yrs experience
Native in: Spanish
Works in: English to Spanish, Spanish to English, French to Spanish
descansan sobre la Plataforma
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Note added at 50 minutos (2016-02-17 16:15:33 GMT)
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Otras opciones: se irán asentando
entran a formar parte integral / se agregan como elemento intrínseco
Nuestra Plataforma de nivel de programa (núcleo de operaciones, el elemento clave que tiene realizarse internamente en la empresa vez de subcontratarse).
Las intervenciones del sector concreto entran a ser *parte integral/intrínseca* de la Plataforma siempre y cuando se requiera y se obtenga la financiación [necesaria] (subsidios/donaciones/fondos corporativos)
Un par de posibles fraseos...
Discussion
"As and when" sería "a medida que surja la necesidad (o cuando fuese/sea necesario) y según se obtenga (se vaya obteniendo) la financiación necesaria"
http://idioms.in/as-and-when/
Nuestra Plataforma a nivel de programa (núcleo de las operaciones, el elemento que debe estar en planilla en vez de subcontratarse)
Las intervenciones específicas del sector se "incorporan" a la Plataforma .... después el "as and" está un poco confuso ... cuando se requieren y se obtiene el financiamiento (subsidios/donaciones/fondos corporativos)