\documentclass{article}
\usepackage{longtable}
\usepackage[nopar]{lipsum}
\usepackage[para]{manyfoot}
\DeclareNewFootnote{A}
\DeclareNewFootnote[para]{B}[alph]
\usepackage[RTLdocument]{bidi}
\usepackage{bidi-longtable}
\makeatletter
\def\LT@startpbox#1{%
  \bgroup
    \let\@footnotetext\LT@p@ftntext
    \let\@LTRfootnotetext\LT@p@LTRftntext
    \let\@RTLfootnotetext\LT@p@RTLftntext
    \let\MFL@fnoteplain\LT@p@MFL@fnoteplain
    \let\MFL@fnotepara\LT@p@MFL@fnotepara
    \setlength\hsize{#1}%
    \@arrayparboxrestore
    \vrule \@height \ht\@arstrutbox \@width \z@}
\def\LT@p@MFL@fnoteplain#1#2#3{%
  \edef\@tempa{\the\LT@p@ftn\noexpand\footnotetextA[\the\c@footnoteA]}%
    \global\LT@p@ftn\expandafter{\@tempa{#3}}}%
\def\LT@p@MFL@fnotepara#1#2#3{%
  \edef\@tempa{\the\LT@p@ftn\noexpand\footnotetextB[\the\c@footnoteB]}%
    \global\LT@p@ftn\expandafter{\@tempa{#3}}}%
\makeatother
\textwidthfootnoterule
\begin{document}
\begin{longtable}{p{0.6\textwidth}l}
\lipsum[1]\footnoteA{This is a footnote.}\footnoteB{This is a footnote.}&row 1
\end{longtable}
\footnoteA{This is a footnote.}\footnoteB{This is a footnote.}
\end{document}