How to put the program in unit and connect it?

Question

Delphi

Exercise:. Given a matrix A of order n. Arrange the elements of each row in ascending order.
The code is working, I can't put the procedures in the unit correctly, please help!

uses
  SysUtils;


Const
  xmin=1;
  xmax=1000;
Type
  Matrix=array[xmin..xmax,xmin..xmax] of Integer;
  {Ïðîöåäóðà äëÿ âûâîäà èñõîäíîé ìàòðèöû íà ýêðàí}

Procedure BM(var a:Matrix;x:Integer);
Var
  i,j:Integer;
Begin
  Writeln('Isxodnaya matrica:');
  For i:=1 to x do
    Begin
      Writeln;
      For j:=1 to x do
        Write(' ',a[i,j],' ')
    End;
  Writeln;
End;
{Êîíåö ïðîöåäóðû âûâîäà íà ýêðàí}
 
{Ïðîöåäóðà ñîðòèðîâêè ñòðî÷åê ïî âîçðàñòàíèþ}
 
Procedure CCTPB(var a: array of integer;x:Integer);
Var
  i,j,c:Integer;
Begin
  For i:=0 to x - 2 do
    For j:=i+1 to x - 1 do
      If a[i]>a[j] then
        Begin
          c:=a[i];
          a[i]:=a[j];
          a[j]:=c
        End
End;

{Êîíåö ïðîöåäóðû ñîðòèðîâêè ïî óáûâàíèþ}
 
Var
  a:matrix;                                                                
  i,j,x,f,v:Integer;                                                     
Begin

  randomize;
  Repeat
    Write('VVedite razmer kvadratnoy matrici v diapazone s ',xmin,' do ',xmax,' : ');
    Readln(x);
  Until (x>xmin) and (x<xmax);
  Writeln('Kak vvesti matricy?');
  Repeat
    Writeln('1 - Avtomaticheskiy vvod matrici ');
    Writeln('2 - Rychnoy vvod matrici');
    Writeln;
    Readln(f);
  Until (f<3) and (f>0);
  {Çàäàíèå ìàòðèöû}
  If f = 1 then
 {Àâòîìàòè÷åñêèé ââîä}
    Begin
      Writeln;
      Write('Vvedite verhnee chislo dlya generatora slychaynih chisel: ');
      Readln(v);
        For i:=1 to x do
          Begin
            For j:=1to x do
              Begin
                a[i,j]:=Random(v);
              End;
          End;
    End
  Else
 {Ðó÷íîé ââîä}
    Begin
      For i:=1 to x do
        Begin
          For j:=1 to x do
            Begin
              Writeln('Vvedite element', i, ' stroki i ', j, ' stolbca: ');
              Readln(a[i,j]);
            End;
        End;
    End;
{Êîíåö çàäàíèÿ ìàòðèöû}
  BM(a,x);
   for i:=1 to x do CCTPB(a[i],x);

  Writeln;
  Writeln('Sortirovka ctrok v poryadke vozrastaniya');
  Writeln;
  Write('Izmenennaya matrica:');
  For i:=1 to x do
    Begin
      Writeln;                                                          
        For j:=1 to x do
          Write(' ',a[i,j],' ') ;
          readln;
        End;
End.