  Supergravity (SUGRA) theories are specified by a few functions, most notably
the real K\"ahler function denoted by $G(T_i, \bar {T}_i) = K + \log |W|^2$,
where K is a real K\"ahler potential, and W is a holomorphic superpotential. A
field redefinition $T_i \rightarrow f_1(T_i)$ does not change neither the
theory, nor the K\"ahler geometry. Similarly, the K\"ahler transformation, $K
\rightarrow K + f_2 + \bar f_2, W \rightarrow e^{-f_2} W$ where $f_2$ is
holomorphic also leaves G and hence the theory and the geometry invariant.
However, if we perform a field redefinition only in $K(T_i,\bar{T}_i)
\rightarrow K(f(T_i),f(\bar{T}_i))$, while keeping the same superpotential
$W(T_i)$, we get a different theory, as G is not invariant under such a
transformation while maintaining the same K\"ahler geometry. This freedom of
choosing $f(T_i)$ allows constructing an infinite number of new theories given
a fixed K\"ahler geometry and a predetermined superpotential W. Our
construction generalizes previous ones that were limited by the holomorphic
property of $W$. In particular it allows for novel inflationary SUGRA models
and particle phenomenology model building, where the different models
correspond to different choices of field redefinitions. We demonstrate this
possibility by constructing several prototypes of inflationary models (hilltop,
Starobinsky-like, plateau, log-squared and bell-curve) all in flat K\"ahler
geometry and an originally renormalizable superpotential $W$. The models are in
accord with current observations and predict $r\in[10^{-6},0.06]$ spanning
several decades that can be easily obtained. In the bell-curve model, there
also exists a built-in gravitational reheating mechanism with $T_R\sim
\mathcal{O}( 10^7 GeV)$.
